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Get examples working, mostly. Some interface expansion for a few of

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the adaptors, allowing default construction of UnaryFunction and
Predicate arguments when they are class types.


[SVN r19081]
This commit is contained in:
Dave Abrahams 2003-07-12 04:15:13 +00:00
parent c4b7aaf281
commit 074007ab8c
14 changed files with 135 additions and 1108 deletions
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27
counting_iterator_example.cpp
View File

@ -8,14 +8,30 @@
#include <iostream> #include <iostream>
#include <iterator> #include <iterator>
#include <vector> #include <vector>
#include <boost/counting_iterator.hpp> #include <boost/iterator/counting_iterator.hpp>
#include <boost/iterator_adaptors.hpp> #include <boost/iterator/indirect_iterator.hpp>
#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
namespace boost { namespace detail
{
template <>
struct iterator_traits<int*>
: ptr_iter_traits<int>
{
};
template <>
struct iterator_traits<int**>
: ptr_iter_traits<int*>
{
};
}}
#endif
int main(int, char*[]) int main(int, char*[])
{ {
// Example of using counting_iterator_generator // Example of using counting_iterator_generator
std::cout << "counting from 0 to 4:" << std::endl; std::cout << "counting from 0 to 4:" << std::endl;
boost::counting_iterator_generator<int>::type first(0), last(4); boost::counting_iterator<int> first(0), last(4);
std::copy(first, last, std::ostream_iterator<int>(std::cout, " ")); std::copy(first, last, std::ostream_iterator<int>(std::cout, " "));
std::cout << std::endl; std::cout << std::endl;
@ -37,13 +53,10 @@ int main(int, char*[])
// Use counting iterator to fill in the array of pointers. // Use counting iterator to fill in the array of pointers.
// causes an ICE with MSVC6 // causes an ICE with MSVC6
#if !defined(BOOST_MSVC) || (BOOST_MSVC > 1200)
std::copy(boost::make_counting_iterator(numbers.begin()), std::copy(boost::make_counting_iterator(numbers.begin()),
boost::make_counting_iterator(numbers.end()), boost::make_counting_iterator(numbers.end()),
std::back_inserter(pointers)); std::back_inserter(pointers));
#endif
#if !defined(BOOST_MSVC) || (BOOST_MSVC > 1300)
// Use indirect iterator to print out numbers by accessing // Use indirect iterator to print out numbers by accessing
// them through the array of pointers. // them through the array of pointers.
std::cout << "indirectly printing out the numbers from 0 to " std::cout << "indirectly printing out the numbers from 0 to "
@ -52,6 +65,6 @@ int main(int, char*[])
boost::make_indirect_iterator(pointers.end()), boost::make_indirect_iterator(pointers.end()),
std::ostream_iterator<int>(std::cout, " ")); std::ostream_iterator<int>(std::cout, " "));
std::cout << std::endl; std::cout << std::endl;
#endif
return 0; return 0;
} }

269
counting_iterator_test.cpp
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@ -1,269 +0,0 @@
// (C) Copyright David Abrahams 2001. Permission to copy, use, modify, sell and
// distribute this software is granted provided this copyright notice appears in
// all copies. This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//
// See http://www.boost.org for most recent version including documentation.
//
// Revision History
// 16 Feb 2001 Added a missing const. Made the tests run (somewhat) with
// plain MSVC again. (David Abrahams)
// 11 Feb 2001 #if 0'd out use of counting_iterator on non-numeric types in
// MSVC without STLport, so that the other tests may proceed
// (David Abrahams)
// 04 Feb 2001 Added use of iterator_tests.hpp (David Abrahams)
// 28 Jan 2001 Removed not_an_iterator detritus (David Abrahams)
// 24 Jan 2001 Initial revision (David Abrahams)
#include <boost/config.hpp>
#ifdef BOOST_MSVC
# pragma warning(disable:4786) // identifier truncated in debug info
#endif
#include <boost/pending/iterator_tests.hpp>
#include <boost/counting_iterator.hpp>
#include <boost/detail/iterator.hpp>
#include <iostream>
#include <climits>
#include <iterator>
#include <stdlib.h>
#ifndef __BORLANDC__
# include <boost/tuple/tuple.hpp>
#endif
#include <vector>
#include <list>
#include <cassert>
#ifndef BOOST_NO_LIMITS
# include <limits>
#endif
#ifndef BOOST_NO_SLIST
# include <slist>
#endif
template <class T> struct is_numeric
{
enum { value =
#ifndef BOOST_NO_LIMITS_COMPILE_TIME_CONSTANTS
std::numeric_limits<T>::is_specialized
#else
// Causes warnings with GCC, but how else can I detect numeric types at
// compile-time?
(boost::is_convertible<int,T>::value &&
boost::is_convertible<T,int>::value)
#endif
};
};
// Special tests for RandomAccess CountingIterators.
template <class CountingIterator>
void category_test(
CountingIterator start,
CountingIterator finish,
std::random_access_iterator_tag)
{
typedef typename
boost::detail::iterator_traits<CountingIterator>::difference_type
difference_type;
difference_type distance = boost::detail::distance(start, finish);
// Pick a random position internal to the range
difference_type offset = (unsigned)rand() % distance;
assert(offset >= 0);
CountingIterator internal = start;
std::advance(internal, offset);
// Try some binary searches on the range to show that it's ordered
assert(std::binary_search(start, finish, *internal));
// #including tuple crashed borland, so I had to give up on tie().
std::pair<CountingIterator,CountingIterator> xy(
std::equal_range(start, finish, *internal));
CountingIterator x = xy.first, y = xy.second;
assert(boost::detail::distance(x, y) == 1);
// Show that values outside the range can't be found
assert(!std::binary_search(start, boost::prior(finish), *finish));
// Do the generic random_access_iterator_test
typedef typename CountingIterator::value_type value_type;
std::vector<value_type> v;
for (value_type z = *start; z != *finish; ++z)
v.push_back(z);
if (v.size() >= 2)
{
// Note that this test requires a that the first argument is
// dereferenceable /and/ a valid iterator prior to the first argument
boost::random_access_iterator_test(start + 1, v.size() - 1, v.begin() + 1);
}
}
// Special tests for bidirectional CountingIterators
template <class CountingIterator>
void category_test(CountingIterator start, CountingIterator finish, std::bidirectional_iterator_tag)
{
if (finish != start
&& finish != boost::next(start)
&& finish != boost::next(boost::next(start)))
{
// Note that this test requires a that the first argument is
// dereferenceable /and/ a valid iterator prior to the first argument
boost::bidirectional_iterator_test(boost::next(start), boost::next(*start), boost::next(boost::next(*start)));
}
}
template <class CountingIterator>
void category_test(CountingIterator start, CountingIterator finish, std::forward_iterator_tag)
{
if (finish != start && finish != boost::next(start))
boost::forward_iterator_test(start, *start, boost::next(*start));
}
template <class CountingIterator>
void test_aux(CountingIterator start, CountingIterator finish)
{
typedef typename CountingIterator::iterator_category category;
typedef typename CountingIterator::value_type value_type;
// If it's a RandomAccessIterator we can do a few delicate tests
category_test(start, finish, category());
// Okay, brute force...
for (CountingIterator p = start; p != finish && boost::next(p) != finish; ++p)
{
assert(boost::next(*p) == *boost::next(p));
}
// prove that a reference can be formed to these values
typedef typename CountingIterator::value_type value;
const value* q = &*start;
(void)q; // suppress unused variable warning
}
template <class Incrementable>
void test(Incrementable start, Incrementable finish)
{
test_aux(boost::make_counting_iterator(start), boost::make_counting_iterator(finish));
}
template <class Integer>
void test_integer(Integer* = 0) // default arg works around MSVC bug
{
Integer start = 0;
Integer finish = 120;
test(start, finish);
}
template <class Container>
void test_container(Container* = 0) // default arg works around MSVC bug
{
Container c(1 + (unsigned)rand() % 1673);
const typename Container::iterator start = c.begin();
// back off by 1 to leave room for dereferenceable value at the end
typename Container::iterator finish = start;
std::advance(finish, c.size() - 1);
test(start, finish);
typedef typename Container::const_iterator const_iterator;
test(const_iterator(start), const_iterator(finish));
}
class my_int1 {
public:
my_int1() { }
my_int1(int x) : m_int(x) { }
my_int1& operator++() { ++m_int; return *this; }
bool operator==(const my_int1& x) const { return m_int == x.m_int; }
private:
int m_int;
};
namespace boost {
template <>
struct counting_iterator_traits<my_int1> {
typedef std::ptrdiff_t difference_type;
typedef std::forward_iterator_tag iterator_category;
};
}
class my_int2 {
public:
typedef void value_type;
typedef void pointer;
typedef void reference;
typedef std::ptrdiff_t difference_type;
typedef std::bidirectional_iterator_tag iterator_category;
my_int2() { }
my_int2(int x) : m_int(x) { }
my_int2& operator++() { ++m_int; return *this; }
my_int2& operator--() { --m_int; return *this; }
bool operator==(const my_int2& x) const { return m_int == x.m_int; }
private:
int m_int;
};
class my_int3 {
public:
typedef void value_type;
typedef void pointer;
typedef void reference;
typedef std::ptrdiff_t difference_type;
typedef std::random_access_iterator_tag iterator_category;
my_int3() { }
my_int3(int x) : m_int(x) { }
my_int3& operator++() { ++m_int; return *this; }
my_int3& operator+=(std::ptrdiff_t n) { m_int += n; return *this; }
std::ptrdiff_t operator-(const my_int3& x) const { return m_int - x.m_int; }
my_int3& operator--() { --m_int; return *this; }
bool operator==(const my_int3& x) const { return m_int == x.m_int; }
bool operator!=(const my_int3& x) const { return m_int != x.m_int; }
bool operator<(const my_int3& x) const { return m_int < x.m_int; }
private:
int m_int;
};
int main()
{
// Test the built-in integer types.
test_integer<char>();
test_integer<unsigned char>();
test_integer<signed char>();
test_integer<wchar_t>();
test_integer<short>();
test_integer<unsigned short>();
test_integer<int>();
test_integer<unsigned int>();
test_integer<long>();
test_integer<unsigned long>();
#if defined(BOOST_HAS_LONG_LONG)
test_integer<long long>();
test_integer<unsigned long long>();
#endif
// wrapping an iterator or non-built-in integer type causes an INTERNAL
// COMPILER ERROR in MSVC without STLport. I'm clueless as to why.
#if !defined(BOOST_MSVC) || BOOST_MSVC > 1200 || defined(__SGI_STL_PORT)
// Test user-defined type.
test_integer<my_int1>();
test_integer<my_int2>();
test_integer<my_int3>();
// Some tests on container iterators, to prove we handle a few different categories
test_container<std::vector<int> >();
test_container<std::list<int> >();
# ifndef BOOST_NO_SLIST
test_container<BOOST_STD_EXTENSION_NAMESPACE::slist<int> >();
# endif
// Also prove that we can handle raw pointers.
int array[2000];
test(boost::make_counting_iterator(array), boost::make_counting_iterator(array+2000-1));
#endif
std::cout << "test successful " << std::endl;
return 0;
}

46
filter_iterator_example.cpp
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@ -11,24 +11,29 @@
#include <algorithm> #include <algorithm>
#include <functional> #include <functional>
#include <iostream> #include <iostream>
#include <boost/iterator_adaptors.hpp> #include <boost/iterator/filter_iterator.hpp>
struct is_positive_number { struct is_positive_number {
bool operator()(int x) { return 0 < x; } bool operator()(int x) { return 0 < x; }
}; };
#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
namespace boost { namespace detail
{
template <>
struct iterator_traits<int*>
: ptr_iter_traits<int>
{
};
}}
#endif
int main() int main()
{ {
int numbers_[] = { 0, -1, 4, -3, 5, 8, -2 }; int numbers_[] = { 0, -1, 4, -3, 5, 8, -2 };
const int N = sizeof(numbers_)/sizeof(int); const int N = sizeof(numbers_)/sizeof(int);
#ifdef BOOST_NO_STD_ITERATOR_TRAITS
// Assume there won't be proper iterator traits for pointers. This
// is just a wrapper for int* which has the right traits.
typedef boost::iterator_adaptor<int*, boost::default_iterator_policies, int> base_iterator;
#else
typedef int* base_iterator; typedef int* base_iterator;
#endif
base_iterator numbers(numbers_); base_iterator numbers(numbers_);
// Example using make_filter_iterator() // Example using make_filter_iterator()
@ -37,23 +42,30 @@ int main()
std::ostream_iterator<int>(std::cout, " ")); std::ostream_iterator<int>(std::cout, " "));
std::cout << std::endl; std::cout << std::endl;
// Example using filter_iterator_generator // Example using filter_iterator
typedef boost::filter_iterator_generator<is_positive_number, base_iterator, int>::type typedef boost::filter_iterator<is_positive_number, base_iterator>
FilterIter; FilterIter;
is_positive_number predicate; is_positive_number predicate;
FilterIter::policies_type policies(predicate, numbers + N); FilterIter filter_iter_first(predicate, numbers, numbers + N);
FilterIter filter_iter_first(numbers, policies); FilterIter filter_iter_last(predicate, numbers + N, numbers + N);
FilterIter filter_iter_last(numbers + N, policies);
std::copy(filter_iter_first, filter_iter_last, std::ostream_iterator<int>(std::cout, " ")); std::copy(filter_iter_first, filter_iter_last, std::ostream_iterator<int>(std::cout, " "));
std::cout << std::endl; std::cout << std::endl;
// Another example using make_filter_iterator() // Another example using make_filter_iterator()
std::copy(boost::make_filter_iterator(numbers, numbers + N, std::copy(
std::bind2nd(std::greater<int>(), -2)), boost::make_filter_iterator(
boost::make_filter_iterator(numbers + N, numbers + N, std::bind2nd(std::greater<int>(), -2)
std::bind2nd(std::greater<int>(), -2)), , numbers, numbers + N)
std::ostream_iterator<int>(std::cout, " "));
, boost::make_filter_iterator(
std::bind2nd(std::greater<int>(), -2)
, numbers + N, numbers + N)
, std::ostream_iterator<int>(std::cout, " ")
);
std::cout << std::endl; std::cout << std::endl;

46
indirect_iterator_example.cpp
View File

@ -8,7 +8,43 @@
#include <iostream> #include <iostream>
#include <iterator> #include <iterator>
#include <functional> #include <functional>
#include <boost/iterator_adaptors.hpp> #include <algorithm>
#include <boost/iterator/indirect_iterator.hpp>
#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
namespace boost { namespace detail
{
template <>
struct iterator_traits<char*>
: ptr_iter_traits<char>
{
};
template <>
struct iterator_traits<char const*>
: ptr_iter_traits<char, char const>
{
};
template <>
struct iterator_traits<char**>
: ptr_iter_traits<char*>
{
};
template <>
struct iterator_traits<char const* const*>
: ptr_iter_traits<char const*, char const* const>
{
};
template <>
struct iterator_traits<char* const*>
: ptr_iter_traits<char*, char* const>
{
};
}}
#endif
int main(int, char*[]) int main(int, char*[])
{ {
@ -20,7 +56,7 @@ int main(int, char*[])
// Example of using indirect_iterator_generator // Example of using indirect_iterator_generator
boost::indirect_iterator_generator<char**, char>::type boost::indirect_iterator<char**, char>
indirect_first(pointers_to_chars), indirect_last(pointers_to_chars + N); indirect_first(pointers_to_chars), indirect_last(pointers_to_chars + N);
std::copy(indirect_first, indirect_last, std::ostream_iterator<char>(std::cout, ",")); std::copy(indirect_first, indirect_last, std::ostream_iterator<char>(std::cout, ","));
@ -29,16 +65,14 @@ int main(int, char*[])
// Example of using indirect_iterator_pair_generator // Example of using indirect_iterator_pair_generator
typedef boost::indirect_iterator_pair_generator<char**, char> PairGen;
char mutable_characters[N]; char mutable_characters[N];
char* pointers_to_mutable_chars[N]; char* pointers_to_mutable_chars[N];
for (int j = 0; j < N; ++j) for (int j = 0; j < N; ++j)
pointers_to_mutable_chars[j] = &mutable_characters[j]; pointers_to_mutable_chars[j] = &mutable_characters[j];
PairGen::iterator mutable_indirect_first(pointers_to_mutable_chars), boost::indirect_iterator<char* const*> mutable_indirect_first(pointers_to_mutable_chars),
mutable_indirect_last(pointers_to_mutable_chars + N); mutable_indirect_last(pointers_to_mutable_chars + N);
PairGen::const_iterator const_indirect_first(pointers_to_chars), boost::indirect_iterator<char const* const*> const_indirect_first(pointers_to_chars),
const_indirect_last(pointers_to_chars + N); const_indirect_last(pointers_to_chars + N);
std::transform(const_indirect_first, const_indirect_last, std::transform(const_indirect_first, const_indirect_last,

151
indirect_iterator_test.cpp
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@ -1,151 +0,0 @@
// (C) Copyright Jeremy Siek 1999. Permission to copy, use, modify,
// sell and distribute this software is granted provided this
// copyright notice appears in all copies. This software is provided
// "as is" without express or implied warranty, and with no claim as
// to its suitability for any purpose.
// Revision History
// 08 Mar 2001 Jeremy Siek
// Moved test of indirect iterator into its own file. It to
// to be in iterator_adaptor_test.cpp.
#include <boost/config.hpp>
#include <iostream>
#include <algorithm>
#include <boost/iterator_adaptors.hpp>
#include <boost/pending/iterator_tests.hpp>
#include <boost/concept_archetype.hpp>
#include <stdlib.h>
#include <deque>
#include <set>
struct my_iterator_tag : public std::random_access_iterator_tag { };
using boost::dummyT;
typedef std::deque<int> storage;
typedef std::deque<int*> pointer_deque;
typedef std::set<storage::iterator> iterator_set;
void more_indirect_iterator_tests()
{
// For some reason all heck breaks loose in the compiler under these conditions.
#if !defined(BOOST_MSVC) || BOOST_MSVC > 1200 || !defined(__STL_DEBUG)
storage store(1000);
std::generate(store.begin(), store.end(), rand);
pointer_deque ptr_deque;
iterator_set iter_set;
for (storage::iterator p = store.begin(); p != store.end(); ++p)
{
ptr_deque.push_back(&*p);
iter_set.insert(p);
}
typedef boost::indirect_iterator_pair_generator<
pointer_deque::iterator
#ifdef BOOST_NO_STD_ITERATOR_TRAITS
, int
#endif
> IndirectDeque;
IndirectDeque::iterator db(ptr_deque.begin());
IndirectDeque::iterator de(ptr_deque.end());
assert(static_cast<std::size_t>(de - db) == store.size());
assert(db + store.size() == de);
IndirectDeque::const_iterator dci(db);
assert(db == dci);
assert(dci == db);
assert(dci != de);
assert(dci < de);
assert(dci <= de);
assert(de >= dci);
assert(de > dci);
dci = de;
assert(dci == de);
boost::random_access_iterator_test(db + 1, store.size() - 1, boost::next(store.begin()));
*db = 999;
assert(store.front() == 999);
// Borland C++ is getting very confused about the typedef's here
typedef boost::indirect_iterator_generator<
iterator_set::iterator
#ifdef BOOST_NO_STD_ITERATOR_TRAITS
, int
#endif
>::type indirect_set_iterator;
typedef boost::indirect_iterator_generator<
iterator_set::iterator,
const int
>::type const_indirect_set_iterator;
indirect_set_iterator sb(iter_set.begin());
indirect_set_iterator se(iter_set.end());
const_indirect_set_iterator sci(iter_set.begin());
assert(sci == sb);
assert(sci != se);
sci = se;
assert(sci == se);
*boost::prior(se) = 888;
assert(store.back() == 888);
assert(std::equal(sb, se, store.begin()));
boost::bidirectional_iterator_test(boost::next(sb), store[1], store[2]);
assert(std::equal(db, de, store.begin()));
#endif
}
int
main()
{
dummyT array[] = { dummyT(0), dummyT(1), dummyT(2),
dummyT(3), dummyT(4), dummyT(5) };
const int N = sizeof(array)/sizeof(dummyT);
// Test indirect_iterator_generator
{
dummyT* ptr[N];
for (int k = 0; k < N; ++k)
ptr[k] = array + k;
typedef boost::indirect_iterator_generator<dummyT**
#ifdef BOOST_NO_STD_ITERATOR_TRAITS
, dummyT
#endif
>::type indirect_iterator;
typedef boost::indirect_iterator_generator<dummyT**, const dummyT>::type const_indirect_iterator;
indirect_iterator i(ptr);
boost::random_access_iterator_test(i, N, array);
#ifndef BOOST_NO_STD_ITERATOR_TRAITS
boost::random_access_iterator_test(boost::make_indirect_iterator(ptr), N, array);
#endif
// check operator->
assert((*i).m_x == i->foo());
const_indirect_iterator j(ptr);
boost::random_access_iterator_test(j, N, array);
dummyT*const* const_ptr = ptr;
#ifndef BOOST_NO_STD_ITERATOR_TRAITS
boost::random_access_iterator_test(boost::make_indirect_iterator(const_ptr), N, array);
#endif
boost::const_nonconst_iterator_test(i, ++j);
more_indirect_iterator_tests();
}
std::cout << "test successful " << std::endl;
return 0;
}

27
iter_adaptor_fail_expected1.cpp
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@ -1,27 +0,0 @@
// Test boost/pending/iterator_adaptors.hpp
// (C) Copyright Jeremy Siek 1999. Permission to copy, use, modify,
// sell and distribute this software is granted provided this
// copyright notice appears in all copies. This software is provided
// "as is" without express or implied warranty, and with no claim as
// to its suitability for any purpose.
// See http://www.boost.org for most recent version including documentation.
// Revision History
// 21 Jan 01 Initial version (Jeremy Siek)
#include <boost/config.hpp>
#include <list>
#include <boost/pending/iterator_adaptors.hpp>
int main()
{
typedef boost::iterator_adaptor<std::list<int>::iterator,
boost::default_iterator_policies,
int,int&,int*,std::bidirectional_iterator_tag> adaptor_type;
adaptor_type i;
i += 4;
return 0;
}

28
iter_adaptor_fail_expected2.cpp
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@ -1,28 +0,0 @@
// Test boost/pending/iterator_adaptors.hpp
// (C) Copyright Jeremy Siek 1999. Permission to copy, use, modify,
// sell and distribute this software is granted provided this
// copyright notice appears in all copies. This software is provided
// "as is" without express or implied warranty, and with no claim as
// to its suitability for any purpose.
// See http://www.boost.org for most recent version including documentation.
// Revision History
// 21 Jan 01 Initial version (Jeremy Siek)
#include <boost/config.hpp>
#include <iostream>
#include <iterator>
#include <boost/pending/iterator_adaptors.hpp>
int main()
{
typedef boost::iterator_adaptor<std::istream_iterator<int>,
boost::default_iterator_policies,
int,int&,int*,std::input_iterator_tag> adaptor_type;
adaptor_type iter;
--iter;
return 0;
}

61
iter_traits_gen_test.cpp
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@ -1,61 +0,0 @@
// (C) Copyright Jeremy Siek 2000. Permission to copy, use, modify,
// sell and distribute this software is granted provided this
// copyright notice appears in all copies. This software is provided
// "as is" without express or implied warranty, and with no claim as
// to its suitability for any purpose.
// 04 Nov 2001 Jeremy Siek
// Updated with respect to new named parameter interface.
// 08 Mar 2001 Jeremy Siek
// Initial checkin.
#include <boost/iterator_adaptors.hpp>
#include <boost/pending/iterator_tests.hpp>
#include <boost/static_assert.hpp>
class bar { };
void foo(bar) { }
int
main()
{
using boost::dummyT;
dummyT array[] = { dummyT(0), dummyT(1), dummyT(2),
dummyT(3), dummyT(4), dummyT(5) };
typedef boost::iterator_adaptor<dummyT*,
boost::default_iterator_policies, dummyT> my_iter;
my_iter mi(array);
{
typedef boost::iterator_adaptor<my_iter, boost::default_iterator_policies,
boost::reference_is<dummyT>,
boost::iterator_category_is<std::input_iterator_tag> > iter_type;
BOOST_STATIC_ASSERT((boost::is_same<iter_type::iterator_category*,
std::input_iterator_tag*>::value));
BOOST_STATIC_ASSERT(( ! boost::is_convertible<iter_type::iterator_category*,
std::forward_iterator_tag*>::value));
iter_type i(mi);
boost::input_iterator_test(i, dummyT(0), dummyT(1));
}
{
typedef boost::iterator_adaptor<dummyT*,
boost::default_iterator_policies,
boost::value_type_is<dummyT>,
boost::reference_is<const dummyT&>,
boost::pointer_is<const dummyT*> ,
boost::iterator_category_is<std::forward_iterator_tag>,
boost::difference_type_is<std::ptrdiff_t> > adaptor_type;
adaptor_type i(array);
boost::input_iterator_test(i, dummyT(0), dummyT(1));
int zero = 0;
if (zero) // don't do this, just make sure it compiles
assert((*i).m_x == i->foo());
}
return 0;
}

6
iterator_adaptor_examples.cpp
View File

@ -7,7 +7,7 @@
#include <functional> #include <functional>
#include <algorithm> #include <algorithm>
#include <iostream> #include <iostream>
#include <boost/iterator_adaptors.hpp> #include <boost/iterator/transform_iterator.hpp>
#include <boost/pending/integer_range.hpp> #include <boost/pending/integer_range.hpp>
int int
@ -21,8 +21,8 @@ main(int, char*[])
int x[] = { 1, 2, 3, 4, 5, 6, 7, 8 }; int x[] = { 1, 2, 3, 4, 5, 6, 7, 8 };
typedef std::binder1st< std::multiplies<int> > Function; typedef std::binder1st< std::multiplies<int> > Function;
typedef boost::transform_iterator_generator<Function, int*
>::type doubling_iterator; typedef boost::transform_iterator<Function, int*> doubling_iterator;
doubling_iterator i(x, std::bind1st(std::multiplies<int>(), 2)), doubling_iterator i(x, std::bind1st(std::multiplies<int>(), 2)),
i_end(x + sizeof(x)/sizeof(int), std::bind1st(std::multiplies<int>(), 2)); i_end(x + sizeof(x)/sizeof(int), std::bind1st(std::multiplies<int>(), 2));

454
iterator_adaptor_test.cpp
View File

@ -1,454 +0,0 @@
// Test boost/iterator_adaptors.hpp
// (C) Copyright Jeremy Siek 1999. Permission to copy, use, modify,
// sell and distribute this software is granted provided this
// copyright notice appears in all copies. This software is provided
// "as is" without express or implied warranty, and with no claim as
// to its suitability for any purpose.
// See http://www.boost.org for most recent version including documentation.
// Revision History
// 30 Nov 01 Added permutation_iterator.(Toon Knapen)
// 19 Nov 01 Added generator_iterator. (Jens Maurer)
// 04 Nov 01 Updated with respect to change in named parameters.
// (Jeremy Siek)
// 08 Mar 01 Moved indirect and transform tests to separate files.
// (Jeremy Siek)
// 19 Feb 01 Take adavantage of improved iterator_traits to do more tests
// on MSVC. Hack around an MSVC-with-STLport internal compiler
// error. (David Abrahams)
// 11 Feb 01 Added test of operator-> for forward and input iterators.
// (Jeremy Siek)
// 11 Feb 01 Borland fixes (David Abrahams)
// 10 Feb 01 Use new adaptors interface. (David Abrahams)
// 10 Feb 01 Use new filter_ interface. (David Abrahams)
// 09 Feb 01 Use new reverse_ and indirect_ interfaces. Replace
// BOOST_NO_STD_ITERATOR_TRAITS with
// BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION to prove we've
// normalized to core compiler capabilities (David Abrahams)
// 08 Feb 01 Use Jeremy's new make_reverse_iterator form; add more
// comprehensive testing. Force-decay array function arguments to
// pointers.
// 07 Feb 01 Added tests for the make_xxx_iterator() helper functions.
// (Jeremy Siek)
// 07 Feb 01 Replaced use of xxx_pair_generator with xxx_generator where
// possible (which was all but the projection iterator).
// (Jeremy Siek)
// 06 Feb 01 Removed now-defaulted template arguments where possible
// Updated names to correspond to new generator naming convention.
// Added a trivial test for make_transform_iterator().
// Gave traits for const iterators a mutable value_type, per std.
// Resurrected my original tests for indirect iterators.
// (David Abrahams)
// 04 Feb 01 Fix for compilers without standard iterator_traits
// (David Abrahams)
// 13 Jun 00 Added const version of the iterator tests (Jeremy Siek)
// 12 Dec 99 Initial version with iterator operators (Jeremy Siek)
#include <boost/config.hpp>
#include <iostream>
#include <algorithm>
#include <functional>
#include <numeric>
#include <boost/iterator_adaptors.hpp>
#include <boost/generator_iterator.hpp>
#include <boost/pending/iterator_tests.hpp>
#include <boost/pending/integer_range.hpp>
#include <boost/concept_archetype.hpp>
#include <boost/type_traits/same_traits.hpp>
#include <boost/permutation_iterator.hpp>
#include <stdlib.h>
#include <vector>
#include <deque>
#include <set>
#include <list>
struct my_iterator_tag : public std::random_access_iterator_tag { };
using boost::dummyT;
struct mult_functor {
typedef int result_type;
typedef int argument_type;
// Functors used with transform_iterator must be
// DefaultConstructible, as the transform_iterator must be
// DefaultConstructible to satisfy the requirements for
// TrivialIterator.
mult_functor() { }
mult_functor(int aa) : a(aa) { }
int operator()(int b) const { return a * b; }
int a;
};
template <class Pair>
struct select1st_
: public std::unary_function<Pair, typename Pair::first_type>
{
const typename Pair::first_type& operator()(const Pair& x) const {
return x.first;
}
typename Pair::first_type& operator()(Pair& x) const {
return x.first;
}
};
struct one_or_four {
bool operator()(dummyT x) const {
return x.foo() == 1 || x.foo() == 4;
}
};
typedef std::deque<int> storage;
typedef std::deque<int*> pointer_deque;
typedef std::set<storage::iterator> iterator_set;
template <class T> struct foo;
void blah(int) { }
struct my_gen
{
typedef int result_type;
my_gen() : n(0) { }
int operator()() { return ++n; }
int n;
};
int
main()
{
dummyT array[] = { dummyT(0), dummyT(1), dummyT(2),
dummyT(3), dummyT(4), dummyT(5) };
const int N = sizeof(array)/sizeof(dummyT);
// sanity check, if this doesn't pass the test is buggy
boost::random_access_iterator_test(array, N, array);
// Check that the policy concept checks and the default policy
// implementation match up.
boost::function_requires<
boost::RandomAccessIteratorPoliciesConcept<
boost::default_iterator_policies,
boost::iterator_adaptor<storage::iterator, boost::default_iterator_policies>,
boost::iterator<std::random_access_iterator_tag, int, std::ptrdiff_t,
int*, int&>
> >();
// Test the named parameters
{
// Test computation of defaults
typedef boost::iterator_adaptor<int*, boost::default_iterator_policies,
boost::value_type_is<int> > Iter1;
// don't use std::iterator_traits here to avoid VC++ problems
BOOST_STATIC_ASSERT((boost::is_same<Iter1::value_type, int>::value));
BOOST_STATIC_ASSERT((boost::is_same<Iter1::reference, int&>::value));
BOOST_STATIC_ASSERT((boost::is_same<Iter1::pointer, int*>::value));
BOOST_STATIC_ASSERT((boost::is_same<Iter1::difference_type, std::ptrdiff_t>::value));
BOOST_STATIC_ASSERT((boost::is_same<Iter1::iterator_category, std::random_access_iterator_tag>::value));
}
{
// Test computation of default when the Value is const
typedef boost::iterator_adaptor<std::list<int>::iterator,
boost::default_iterator_policies,
boost::value_type_is<const int> > Iter1;
BOOST_STATIC_ASSERT((boost::is_same<Iter1::value_type, int>::value));
#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551)) || BOOST_WORKAROUND(BOOST_MSVC, <= 1300)
// We currently don't know how to workaround this bug.
BOOST_STATIC_ASSERT((boost::is_same<Iter1::reference, int&>::value));
BOOST_STATIC_ASSERT((boost::is_same<Iter1::pointer, int*>::value));
#else
BOOST_STATIC_ASSERT((boost::is_same<Iter1::reference, const int&>::value));
BOOST_STATIC_ASSERT((boost::is_same<Iter1::pointer, const int*>::value));
#endif
}
{
// Test with no defaults
typedef boost::iterator_adaptor<int*, boost::default_iterator_policies,
boost::reference_is<long>,
boost::pointer_is<float*>,
boost::value_type_is<char>,
boost::iterator_category_is<std::input_iterator_tag>,
boost::difference_type_is<int>
> Iter1;
BOOST_STATIC_ASSERT((boost::is_same<Iter1::value_type, char>::value));
BOOST_STATIC_ASSERT((boost::is_same<Iter1::reference, long>::value));
BOOST_STATIC_ASSERT((boost::is_same<Iter1::pointer, float*>::value));
BOOST_STATIC_ASSERT((boost::is_same<Iter1::difference_type, int>::value));
BOOST_STATIC_ASSERT((boost::is_same<Iter1::iterator_category, std::input_iterator_tag>::value));
}
// Test the iterator_adaptor
{
boost::iterator_adaptor<dummyT*, boost::default_iterator_policies, dummyT> i(array);
boost::random_access_iterator_test(i, N, array);
boost::iterator_adaptor<const dummyT*, boost::default_iterator_policies, const dummyT> j(array);
boost::random_access_iterator_test(j, N, array);
boost::const_nonconst_iterator_test(i, ++j);
}
// Test projection_iterator_pair_generator
{
typedef std::pair<dummyT,dummyT> Pair;
Pair pair_array[N];
for (int k = 0; k < N; ++k)
pair_array[k].first = array[k];
typedef boost::projection_iterator_pair_generator<select1st_<Pair>,
Pair*, const Pair*
> Projection;
Projection::iterator i(pair_array);
boost::random_access_iterator_test(i, N, array);
boost::random_access_iterator_test(boost::make_projection_iterator(pair_array, select1st_<Pair>()), N, array);
boost::random_access_iterator_test(boost::make_projection_iterator< select1st_<Pair> >(pair_array), N, array);
Projection::const_iterator j(pair_array);
boost::random_access_iterator_test(j, N, array);
boost::random_access_iterator_test(boost::make_const_projection_iterator(pair_array, select1st_<Pair>()), N, array);
boost::random_access_iterator_test(boost::make_const_projection_iterator<select1st_<Pair> >(pair_array), N, array);
boost::const_nonconst_iterator_test(i, ++j);
}
// Test reverse_iterator_generator
{
dummyT reversed[N];
std::copy(array, array + N, reversed);
std::reverse(reversed, reversed + N);
typedef boost::reverse_iterator_generator<dummyT*
#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) || defined(BOOST_NO_STD_ITERATOR_TRAITS)
, dummyT
#endif
>::type reverse_iterator;
reverse_iterator i(reversed + N);
boost::random_access_iterator_test(i, N, array);
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) && !defined(BOOST_NO_STD_ITERATOR_TRAITS)
boost::random_access_iterator_test(boost::make_reverse_iterator(reversed + N), N, array);
#endif
typedef boost::reverse_iterator_generator<const dummyT*
#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) || defined(BOOST_NO_STD_ITERATOR_TRAITS)
, dummyT, const dummyT&, const dummyT
#endif
>::type const_reverse_iterator;
const_reverse_iterator j(reversed + N);
boost::random_access_iterator_test(j, N, array);
const dummyT* const_reversed = reversed;
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) && !defined(BOOST_NO_STD_ITERATOR_TRAITS)
boost::random_access_iterator_test(boost::make_reverse_iterator(const_reversed + N), N, array);
#endif
boost::const_nonconst_iterator_test(i, ++j);
}
// Test reverse_iterator_generator again, with traits fully deducible on all platforms
{
std::deque<dummyT> reversed_container;
std::reverse_copy(array, array + N, std::back_inserter(reversed_container));
const std::deque<dummyT>::iterator reversed = reversed_container.begin();
typedef boost::reverse_iterator_generator<
std::deque<dummyT>::iterator>::type reverse_iterator;
typedef boost::reverse_iterator_generator<
std::deque<dummyT>::const_iterator, const dummyT>::type const_reverse_iterator;
// MSVC/STLport gives an INTERNAL COMPILER ERROR when any computation
// (e.g. "reversed + N") is used in the constructor below.
const std::deque<dummyT>::iterator finish = reversed_container.end();
reverse_iterator i(finish);
boost::random_access_iterator_test(i, N, array);
boost::random_access_iterator_test(boost::make_reverse_iterator(reversed + N), N, array);
const_reverse_iterator j = reverse_iterator(finish);
boost::random_access_iterator_test(j, N, array);
const std::deque<dummyT>::const_iterator const_reversed = reversed;
boost::random_access_iterator_test(boost::make_reverse_iterator(const_reversed + N), N, array);
// Many compilers' builtin deque iterators don't interoperate well, though
// STLport fixes that problem.
#if defined(__SGI_STL_PORT) \
|| (!BOOST_WORKAROUND(__GNUC__, < 3) \
&& !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551)) \
&& !BOOST_WORKAROUND(BOOST_MSVC, <= 1200))
boost::const_nonconst_iterator_test(i, ++j);
#endif
}
// Test integer_range's iterators
{
int int_array[] = { 0, 1, 2, 3, 4, 5 };
boost::integer_range<int> r(0, 5);
boost::random_access_iterator_test(r.begin(), r.size(), int_array);
}
// Test filter iterator
{
// Using typedefs for filter_gen::type confused Borland terribly.
typedef boost::detail::non_bidirectional_category<dummyT*>::type category;
typedef boost::filter_iterator_generator<one_or_four, dummyT*
#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) || defined(BOOST_NO_STD_ITERATOR_TRAITS)
, dummyT
#endif
>::type filter_iter;
#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
// Borland is choking on accessing the policies_type explicitly
// from the filter_iter.
boost::forward_iterator_test(make_filter_iterator(array, array+N,
one_or_four()),
dummyT(1), dummyT(4));
#else
filter_iter i(array, filter_iter::policies_type(one_or_four(), array + N));
boost::forward_iterator_test(i, dummyT(1), dummyT(4));
#endif
#if !BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
enum { is_forward = boost::is_same<
filter_iter::iterator_category,
std::forward_iterator_tag>::value };
BOOST_STATIC_ASSERT(is_forward);
#endif
// On compilers not supporting partial specialization, we can do more type
// deduction with deque iterators than with pointers... unless the library
// is broken ;-(
#if !BOOST_WORKAROUND(BOOST_MSVC, <= 1200 && !__SGI_STL_PORT)
std::deque<dummyT> array2;
std::copy(array+0, array+N, std::back_inserter(array2));
boost::forward_iterator_test(
boost::make_filter_iterator(array2.begin(), array2.end(), one_or_four()),
dummyT(1), dummyT(4));
boost::forward_iterator_test(
boost::make_filter_iterator<one_or_four>(array2.begin(), array2.end()),
dummyT(1), dummyT(4));
#endif
#if !BOOST_WORKAROUND(BOOST_MSVC, <= 1200) // This just freaks MSVC6 out completely
boost::forward_iterator_test(
boost::make_filter_iterator<one_or_four>(
boost::make_reverse_iterator(array2.end()),
boost::make_reverse_iterator(array2.begin())
),
dummyT(4), dummyT(1));
#endif
#if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) && !defined(BOOST_NO_STD_ITERATOR_TRAITS)
boost::forward_iterator_test(
boost::make_filter_iterator(array+0, array+N, one_or_four()),
dummyT(1), dummyT(4));
boost::forward_iterator_test(
boost::make_filter_iterator<one_or_four>(array, array + N),
dummyT(1), dummyT(4));
#endif
}
// check operator-> with a forward iterator
{
boost::forward_iterator_archetype<dummyT> forward_iter;
#if BOOST_WORKAROUND(__BORLANDC__, BOOST_TESTED_AT(0x551))
typedef boost::iterator_adaptor<boost::forward_iterator_archetype<dummyT>,
boost::default_iterator_policies,
dummyT, const dummyT&, const dummyT*,
std::forward_iterator_tag, std::ptrdiff_t> adaptor_type;
#else
typedef boost::iterator_adaptor<boost::forward_iterator_archetype<dummyT>,
boost::default_iterator_policies,
boost::reference_is<const dummyT&>,
boost::pointer_is<const dummyT*> ,
boost::iterator_category_is<std::forward_iterator_tag>,
boost::value_type_is<dummyT>,
boost::difference_type_is<std::ptrdiff_t>
> adaptor_type;
#endif
adaptor_type i(forward_iter);
int zero = 0;
if (zero) // don't do this, just make sure it compiles
assert((*i).m_x == i->foo());
}
// check operator-> with an input iterator
{
boost::input_iterator_archetype<dummyT> input_iter;
typedef boost::iterator_adaptor<boost::input_iterator_archetype<dummyT>,
boost::default_iterator_policies,
dummyT, const dummyT&, const dummyT*,
std::input_iterator_tag, std::ptrdiff_t> adaptor_type;
adaptor_type i(input_iter);
int zero = 0;
if (zero) // don't do this, just make sure it compiles
assert((*i).m_x == i->foo());
}
{
// check generator_iterator
my_gen g1;
boost::generator_iterator_generator<my_gen>::type gen =
boost::make_generator_iterator(g1);
assert(*gen == 1);
++gen;
gen++;
assert(*gen == 3);
}
{
// check permutation_iterator
typedef std::deque< int > element_range_type;
typedef std::list< int > index_type;
static const int element_range_size = 10;
static const int index_size = 4;
element_range_type elements( element_range_size );
for(element_range_type::iterator el_it = elements.begin();
el_it != elements.end();
++el_it)
{
*el_it = std::distance( elements.begin(), el_it );
}
index_type indices( index_size );
for(index_type::iterator i_it = indices.begin();
i_it != indices.end();
++i_it)
{
*i_it = element_range_size - index_size
+ std::distance(indices.begin(), i_it );
}
std::reverse( indices.begin(), indices.end() );
typedef boost::permutation_iterator_generator< element_range_type::iterator, index_type::iterator >::type permutation_type;
permutation_type begin = boost::make_permutation_iterator( elements.begin(), indices.begin() );
permutation_type end = boost::make_permutation_iterator( elements.begin(), indices.end() );
int expected_outcome[] = { 9, 8, 7, 6 };
assert( std::equal( begin, end, expected_outcome ) );
}
std::cout << "test successful " << std::endl;
return 0;
}

49
projection_iterator_example.cpp
View File

@ -9,7 +9,7 @@
#include <iterator> #include <iterator>
#include <algorithm> #include <algorithm>
#include <string> #include <string>
#include <boost/iterator_adaptors.hpp> #include <boost/iterator/transform_iterator.hpp>
struct personnel_record { struct personnel_record {
personnel_record(std::string n, int id) : m_name(n), m_ID(id) { } personnel_record(std::string n, int id) : m_name(n), m_ID(id) { }
@ -19,7 +19,7 @@ struct personnel_record {
struct select_name { struct select_name {
typedef personnel_record argument_type; typedef personnel_record argument_type;
typedef std::string result_type; typedef std::string const& result_type;
const std::string& operator()(const personnel_record& r) const { const std::string& operator()(const personnel_record& r) const {
return r.m_name; return r.m_name;
} }
@ -30,7 +30,7 @@ struct select_name {
struct select_ID { struct select_ID {
typedef personnel_record argument_type; typedef personnel_record argument_type;
typedef int result_type; typedef int& result_type;
const int& operator()(const personnel_record& r) const { const int& operator()(const personnel_record& r) const {
return r.m_ID; return r.m_ID;
} }
@ -48,11 +48,16 @@ int main(int, char*[])
personnel_list.push_back(personnel_record("Wilma", 62454)); personnel_list.push_back(personnel_record("Wilma", 62454));
personnel_list.push_back(personnel_record("Betty", 20490)); personnel_list.push_back(personnel_record("Betty", 20490));
// Example of using projection_iterator_generator // Example of using transform_iterator to print out the names in the
// to print out the names in the personnel list. // personnel list using a projection.
boost::projection_iterator_generator<select_name, boost::transform_iterator<
std::list<personnel_record>::iterator>::type select_name
, std::list<personnel_record>::iterator
#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
, std::string
#endif
>
personnel_first(personnel_list.begin()), personnel_first(personnel_list.begin()),
personnel_last(personnel_list.end()); personnel_last(personnel_list.end());
@ -60,14 +65,12 @@ int main(int, char*[])
std::ostream_iterator<std::string>(std::cout, "\n")); std::ostream_iterator<std::string>(std::cout, "\n"));
std::cout << std::endl; std::cout << std::endl;
// Example of using projection_iterator_pair_generator // Example of using transform_iterator with const_iterators to
// to assign new ID numbers to the personnel. // assign new ID numbers to the personnel.
typedef boost::projection_iterator_pair_generator<select_ID, boost::transform_iterator<
std::list<personnel_record>::iterator, select_ID, std::list<personnel_record>::iterator
std::list<personnel_record>::const_iterator> PairGen; > ID_first(personnel_list.begin()),
PairGen::iterator ID_first(personnel_list.begin()),
ID_last(personnel_list.end()); ID_last(personnel_list.end());
int new_id = 0; int new_id = 0;
@ -76,21 +79,25 @@ int main(int, char*[])
++ID_first; ++ID_first;
} }
PairGen::const_iterator const_ID_first(personnel_list.begin()), boost::transform_iterator<
select_ID, std::list<personnel_record>::const_iterator, int const&
>
const_ID_first(personnel_list.begin()),
const_ID_last(personnel_list.end()); const_ID_last(personnel_list.end());
std::copy(const_ID_first, const_ID_last, std::copy(const_ID_first, const_ID_last,
std::ostream_iterator<int>(std::cout, " ")); std::ostream_iterator<int>(std::cout, " "));
std::cout << std::endl; std::cout << std::endl;
std::cout << std::endl; std::cout << std::endl;
#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
// Example of using make_const_projection_iterator() // Example of using make_const_projection_iterator()
// to print out the names in the personnel list again. // to print out the names in the personnel list again.
std::copy(
boost::make_transform_iterator<select_name>(personnel_list.begin())
, boost::make_transform_iterator<select_name>(personnel_list.end())
, std::ostream_iterator<std::string>(std::cout, "\n"));
#endif
std::copy
(boost::make_const_projection_iterator<select_name>(personnel_list.begin()),
boost::make_const_projection_iterator<select_name>(personnel_list.end()),
std::ostream_iterator<std::string>(std::cout, "\n"));
return 0; return 0;
} }

21
reverse_iterator_example.cpp
View File

@ -6,19 +6,24 @@
#include <boost/config.hpp> #include <boost/config.hpp>
#include <iostream> #include <iostream>
#include <algorithm> #include <algorithm>
#include <boost/iterator_adaptors.hpp> #include <boost/iterator/reverse_iterator.hpp>
#include <boost/detail/iterator.hpp>
#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
namespace boost { namespace detail
{
template <>
struct iterator_traits<char*>
: ptr_iter_traits<char>
{
};
}}
#endif
int main(int, char*[]) int main(int, char*[])
{ {
char letters_[] = "hello world!"; char letters_[] = "hello world!";
const int N = sizeof(letters_)/sizeof(char) - 1; const int N = sizeof(letters_)/sizeof(char) - 1;
#ifdef BOOST_NO_STD_ITERATOR_TRAITS
// Assume there won't be proper iterator traits for pointers. This
// is just a wrapper for char* which has the right traits.
typedef boost::iterator_adaptor<char*, boost::default_iterator_policies, char> base_iterator;
#else
typedef char* base_iterator; typedef char* base_iterator;
#endif
base_iterator letters(letters_); base_iterator letters(letters_);
std::cout << "original sequence of letters:\t" std::cout << "original sequence of letters:\t"
@ -29,7 +34,7 @@ int main(int, char*[])
// Use reverse_iterator_generator to print a sequence // Use reverse_iterator_generator to print a sequence
// of letters in reverse order. // of letters in reverse order.
boost::reverse_iterator_generator<base_iterator>::type boost::reverse_iterator<base_iterator>
reverse_letters_first(letters + N), reverse_letters_first(letters + N),
reverse_letters_last(letters); reverse_letters_last(letters);

4
transform_iterator_example.cpp
View File

@ -7,7 +7,7 @@
#include <functional> #include <functional>
#include <algorithm> #include <algorithm>
#include <iostream> #include <iostream>
#include <boost/iterator_adaptors.hpp> #include <boost/iterator/transform_iterator.hpp>
// What a bummer. We can't use std::binder1st with transform iterator // What a bummer. We can't use std::binder1st with transform iterator
// because it does not have a default constructor. Here's a version // because it does not have a default constructor. Here's a version
@ -53,7 +53,7 @@ main(int, char*[])
const int N = sizeof(x)/sizeof(int); const int N = sizeof(x)/sizeof(int);
typedef boost::binder1st< std::multiplies<int> > Function; typedef boost::binder1st< std::multiplies<int> > Function;
typedef boost::transform_iterator_generator<Function, int*>::type doubling_iterator; typedef boost::transform_iterator<Function, int*> doubling_iterator;
doubling_iterator i(x, boost::bind1st(std::multiplies<int>(), 2)), doubling_iterator i(x, boost::bind1st(std::multiplies<int>(), 2)),
i_end(x + N, boost::bind1st(std::multiplies<int>(), 2)); i_end(x + N, boost::bind1st(std::multiplies<int>(), 2));

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transform_iterator_test.cpp
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@ -1,54 +0,0 @@
// (C) Copyright Jeremy Siek 1999. Permission to copy, use, modify,
// sell and distribute this software is granted provided this
// copyright notice appears in all copies. This software is provided
// "as is" without express or implied warranty, and with no claim as
// to its suitability for any purpose.
// Revision History
// 08 Mar 2001 Jeremy Siek
// Moved test of transform iterator into its own file. It to
// to be in iterator_adaptor_test.cpp.
#include <boost/config.hpp>
#include <iostream>
#include <algorithm>
#include <boost/iterator_adaptors.hpp>
#include <boost/pending/iterator_tests.hpp>
struct mult_functor {
typedef int result_type;
typedef int argument_type;
// Functors used with transform_iterator must be
// DefaultConstructible, as the transform_iterator must be
// DefaultConstructible to satisfy the requirements for
// TrivialIterator.
mult_functor() { }
mult_functor(int aa) : a(aa) { }
int operator()(int b) const { return a * b; }
int a;
};
int
main()
{
const int N = 10;
// Borland is getting confused about typedef's and constructors here
// Test transform_iterator
{
int x[N], y[N];
for (int k = 0; k < N; ++k)
x[k] = k;
std::copy(x, x + N, y);
for (int k2 = 0; k2 < N; ++k2)
x[k2] = x[k2] * 2;
boost::transform_iterator_generator<mult_functor, int*>::type i(y, mult_functor(2));
boost::input_iterator_test(i, x[0], x[1]);
boost::input_iterator_test(boost::make_transform_iterator(&y[0], mult_functor(2)), x[0], x[1]);
}
std::cout << "test successful " << std::endl;
return 0;
}