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Add operator++, operator--

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This commit is contained in:
Peter Dimov 2021-06-27 11:30:02 +03:00
parent a01d4473ab
commit bfc742d854
3 changed files with 54 additions and 0 deletions
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19
include/boost/lambda2/lambda2.hpp
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@ -97,6 +97,12 @@ BOOST_LAMBDA2_BINARY_FN(>>, right_shift)
BOOST_LAMBDA2_UNARY_FN(+, unary_plus)
BOOST_LAMBDA2_UNARY_FN(*, dereference)
BOOST_LAMBDA2_UNARY_FN(++, increment)
BOOST_LAMBDA2_UNARY_FN(--, decrement)
BOOST_LAMBDA2_POSTFIX_FN(++, postfix_increment)
BOOST_LAMBDA2_POSTFIX_FN(--, postfix_decrement)
// operators
template<class T> using remove_cvref_t = std::remove_cv_t<std::remove_reference_t<T>>;
@ -119,6 +125,13 @@ template<class A, class B> using enable_binary_lambda =
return std::bind( fn(), std::forward<A>(a) ); \
}
#define BOOST_LAMBDA2_POSTFIX_LAMBDA(op, fn) \
template<class A, class = lambda2_detail::enable_unary_lambda<A>> \
auto operator op( A&& a, int ) \
{ \
return std::bind( fn(), std::forward<A>(a) ); \
}
#define BOOST_LAMBDA2_BINARY_LAMBDA(op, fn) \
template<class A, class B, class = lambda2_detail::enable_binary_lambda<A, B>> \
auto operator op( A&& a, B&& b ) \
@ -159,6 +172,12 @@ BOOST_LAMBDA2_BINARY_LAMBDA(>>, lambda2_detail::right_shift)
BOOST_LAMBDA2_UNARY_LAMBDA(+, lambda2_detail::unary_plus)
BOOST_LAMBDA2_UNARY_LAMBDA(*, lambda2_detail::dereference)
BOOST_LAMBDA2_UNARY_LAMBDA(++, lambda2_detail::increment)
BOOST_LAMBDA2_UNARY_LAMBDA(--, lambda2_detail::decrement)
BOOST_LAMBDA2_POSTFIX_LAMBDA(++, lambda2_detail::postfix_increment)
BOOST_LAMBDA2_POSTFIX_LAMBDA(--, lambda2_detail::postfix_decrement)
} // namespace lambda2
} // namespace boost

1
test/Jamfile
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@ -21,3 +21,4 @@ run version.cpp ;
run lookup_problem.cpp ;
run dereference.cpp ;
run placeholders.cpp ;
run increment.cpp ;

34
test/increment.cpp Normal file
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@ -0,0 +1,34 @@
// Copyright 2021 Peter Dimov
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/lambda2.hpp>
#include <boost/core/lightweight_test.hpp>
#include <functional>
int main()
{
using namespace boost::lambda2;
int x1 = 1, x2 = 2, y1 = 1, y2 = 2;
BOOST_TEST_EQ( (_1++)(x1), y1++ );
BOOST_TEST_EQ( (++_1)(x1), ++y1 );
BOOST_TEST_EQ( (_1--)(x1), y1-- );
BOOST_TEST_EQ( (--_1)(x1), --y1 );
BOOST_TEST_EQ( (_1++ + _2++)(x1, x2), y1++ + y2++ );
BOOST_TEST_EQ( (++_1 + ++_2)(x1, x2), ++y1 + ++y2 );
BOOST_TEST_EQ( (_1-- + _2--)(x1, x2), y1-- + y2-- );
BOOST_TEST_EQ( (--_1 + --_2)(x1, x2), --y1 + --y2 );
BOOST_TEST_EQ( std::bind(_1 + _2, _1++, _2++)(x1, x2), y1++ + y2++ );
BOOST_TEST_EQ( std::bind(_1 + _2, ++_1, ++_2)(x1, x2), ++y1 + ++y2 );
BOOST_TEST_EQ( std::bind(_1 + _2, _1--, _2--)(x1, x2), y1-- + y2-- );
BOOST_TEST_EQ( std::bind(_1 + _2, --_1, --_2)(x1, x2), --y1 + --y2 );
return boost::report_errors();
}