boost/ptr_container
2
0
Fork 0
mirror of https://github.com/boostorg/ptr_container.git synced 2026-02-23 16:02:10 +00:00
Code Issues Projects Releases Wiki Activity

*** empty log message ***

Browse Source 
[SVN r27749]
This commit is contained in:
Thorsten Jørgen Ottosen
2005-03-21 00:01:27 +00:00
commit 5eaf3a0e88
119 changed files with 12996 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

118
test/map_value_iterator.cpp Executable file
View File

@@ -0,0 +1,118 @@
#include <boost/iterator/transform_iterator.hpp>
template< class Map >
struct select_first
{
typedef typename Map::key_type& result_type;
result_type operator()( const typename Map::value_type& r ) const
{
return r.first;
}
};
template< class Map >
struct select_second
{
typedef typename Map::mapped_type& result_type;
result_type operator()( const typename Map::value_type& r ) const
{
return r.second;
}
};
template< class Map >
struct map_key_iterator :
public boost::transform_iterator< select_first<Map>,
typename Map::const_iterator >
{
private:
typedef boost::transform_iterator< select_first<Map>,
typename Map::const_iterator >
base;
typedef typename Map::const_iterator iterator;
public:
map_key_iterator() : base()
{ }
map_key_iterator( iterator x ) : base(x)
{ }
map_key_iterator& operator=( iterator r )
{
base::operator=(r);
return *this;
}
};
template< class Map >
struct map_value_iterator :
public boost::transform_iterator< select_second<Map>,
typename Map::iterator >
{
private:
typedef boost::transform_iterator< select_second<Map>,
typename Map::iterator >
base;
typedef typename Map::iterator iterator;
public:
map_value_iterator() : base()
{ }
map_value_iterator( iterator x ) : base(x)
{ }
map_value_iterator& operator=( iterator r )
{
base::operator=(r);
return *this;
}
};
template< class Map >
struct map_const_value_iterator :
public boost::transform_iterator< select_second<Map>,
typename Map::const_iterator >
{
private:
typedef boost::transform_iterator< select_second<Map>,
typename Map::const_iterator >
base;
typedef typename Map::const_iterator iterator;
public:
map_const_value_iterator() : base()
{ }
map_const_value_iterator( iterator x ) : base(x)
{ }
map_const_value_iterator& operator=( iterator r )
{
base::operator=(r);
return *this;
}
};
#include <map>
int main()
{
typedef std::map<int,int> map;
map m;
map_key_iterator<map> key_begin = m.begin();
map_value_iterator<map> value_begin = m.begin();
map_const_value_iterator<map> value_end = m.end();
key_begin++;
value_begin++;
value_end--;
}