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[geometry] fixed c08 example w.r.t. iterators

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[SVN r85294]
This commit is contained in:
Barend Gehrels 2013-08-10 22:18:27 +00:00
parent 1fa129395f
commit 914f558a3c
1 changed files with 47 additions and 21 deletions
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68
example/c08_custom_non_std_example.cpp
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@ -65,41 +65,59 @@ class my_polygon
// Adaption: implement iterator and range-extension, and register with Boost.Geometry
// 1) implement iterator (const and non-const versions)
template <bool IsConst>
template<typename MyPolygon>
struct custom_iterator : public boost::iterator_facade
<
custom_iterator<IsConst>,
custom_iterator<MyPolygon>,
my_point,
boost::random_access_traversal_tag,
typename boost::geometry::add_const_if_c<IsConst, my_point>::type&
typename boost::mpl::if_
<
boost::is_const<MyPolygon>,
my_point const,
my_point
>::type&
>
{
// Constructor for begin()
explicit custom_iterator(typename boost::geometry::add_const_if_c<IsConst, my_polygon>::type& polygon)
explicit custom_iterator(MyPolygon& polygon)
: m_polygon(&polygon)
, m_index(0)
{}
// Constructor for end()
explicit custom_iterator(bool, typename boost::geometry::add_const_if_c<IsConst, my_polygon>::type& polygon)
explicit custom_iterator(bool, MyPolygon& polygon)
: m_polygon(&polygon)
, m_index(polygon.point_count())
{}
// Default constructor
explicit custom_iterator()
: m_polygon(NULL)
, m_index(-1)
{}
typedef typename boost::mpl::if_
<
boost::is_const<MyPolygon>,
my_point const,
my_point
>::type my_point_type;
private:
friend class boost::iterator_core_access;
typedef boost::iterator_facade
<
custom_iterator<IsConst>,
custom_iterator<MyPolygon>,
my_point,
boost::random_access_traversal_tag,
typename boost::geometry::add_const_if_c<IsConst, my_point>::type&
my_point_type&
> facade;
typename boost::geometry::add_const_if_c<IsConst, my_polygon>::type* m_polygon;
MyPolygon* m_polygon;
int m_index;
bool equal(custom_iterator const& other) const
@ -134,7 +152,7 @@ private:
}
// const and non-const dereference of this iterator
typename boost::geometry::add_const_if_c<IsConst, my_point>::type& dereference() const
my_point_type& dereference() const
{
return m_polygon->get_point(m_index);
}
@ -150,12 +168,12 @@ namespace boost
{
template<> struct range_mutable_iterator<my_polygon>
{
typedef custom_iterator<false> type;
typedef custom_iterator<my_polygon> type;
};
template<> struct range_const_iterator<my_polygon>
{
typedef custom_iterator<true> type;
typedef custom_iterator<my_polygon const> type;
};
// RangeEx
@ -168,24 +186,24 @@ namespace boost
// 2b) free-standing function for Boost.Range ADP
inline custom_iterator<false> range_begin(my_polygon& polygon)
inline custom_iterator<my_polygon> range_begin(my_polygon& polygon)
{
return custom_iterator<false>(polygon);
return custom_iterator<my_polygon>(polygon);
}
inline custom_iterator<true> range_begin(my_polygon const& polygon)
inline custom_iterator<my_polygon const> range_begin(my_polygon const& polygon)
{
return custom_iterator<true>(polygon);
return custom_iterator<my_polygon const>(polygon);
}
inline custom_iterator<false> range_end(my_polygon& polygon)
inline custom_iterator<my_polygon> range_end(my_polygon& polygon)
{
return custom_iterator<false>(true, polygon);
return custom_iterator<my_polygon>(true, polygon);
}
inline custom_iterator<true> range_end(my_polygon const& polygon)
inline custom_iterator<my_polygon const> range_end(my_polygon const& polygon)
{
return custom_iterator<true>(true, polygon);
return custom_iterator<my_polygon const>(true, polygon);
}
@ -210,6 +228,14 @@ template<> struct resize<my_polygon>
}
};
template<> struct clear<my_polygon>
{
static inline void apply(my_polygon& polygon)
{
polygon.erase_all();
}
};
}}}
@ -225,8 +251,8 @@ BOOST_GEOMETRY_REGISTER_RING(my_polygon)
void walk_using_iterator(my_polygon const& polygon)
{
for (custom_iterator<true> it = custom_iterator<true>(polygon);
it != custom_iterator<true>(true, polygon);
for (custom_iterator<my_polygon const> it = custom_iterator<my_polygon const>(polygon);
it != custom_iterator<my_polygon const>(true, polygon);
++it)
{
std::cout << boost::geometry::dsv(*it) << std::endl;