zypp::MapKVIteratorTraits< _Map > Struct Template Reference
[Boost.Iterator Library]

Traits for std::map key and value iterators. More...

#include <Iterator.h>

List of all members.

Public Types
typedef _Map	MapType
	The map type.
typedef _Map::key_type	KeyType
	The maps key type.
typedef transform_iterator < GetPairFirst < typename MapType::value_type >, typename MapType::const_iterator >	Key_const_iterator
	The key iterator type.
typedef _Map::mapped_type	ValueType
	The maps value (mapped) type.
typedef transform_iterator < GetPairSecond < typename MapType::value_type >, typename MapType::const_iterator >	Value_const_iterator
	The value iterator type.

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Detailed Description

template<class _Map>
struct zypp::MapKVIteratorTraits< _Map >

Traits for std::map key and value iterators.

GetPairFirst and GetPairSecond help building a transform_iterator that iterates over keys or values of a std::map. Class MapKVIteratorTraits provides some typedefs, you usg. do not want to write explicitly.

 // typedefs
 typedef std::map<K,V> MapType;

 // transform_iterator<GetPairFirst<MapType::value_type>,  MapType::const_iterator>
 typedef MapKVIteratorTraits<MapType>::Key_const_iterator MapTypeKey_iterator;
 // transform_iterator<GetPairSecond<MapType::value_type>, MapType::const_iterator>
 typedef MapKVIteratorTraits<MapType>::Value_const_iterator  MapTypeValue_iterator;

 // usage
 MapType mymap;

 MapTypeKey_const_iterator keyBegin( make_map_key_begin( mymap ) );
 MapTypeKey_const_iterator keyEnd  ( make_map_key_end( mymap ) );

 MapTypeKey_const_iterator valBegin( make_map_value_begin( mymap ) );
 MapTypeKey_const_iterator valEnd  ( make_map_value_end( mymap ) );

 std::for_each( keyBegin, keyEnd, DoSomething() );
 std::for_each( valBegin, valEnd, DoSomething() );

Or short:

 typedef std::map<K,V> MapType;
 MapType mymap;

 std::for_each( make_map_key_begin( mymap ),   make_map_key_end( mymap ),   DoSomething() );
 std::for_each( make_map_value_begin( mymap ), make_map_value_end( mymap ), DoSomething() );

Definition at line 208 of file Iterator.h.

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Member Typedef Documentation

template<class _Map>

typedef _Map zypp::MapKVIteratorTraits< _Map >::MapType

The map type.

Definition at line 211 of file Iterator.h.

template<class _Map>

typedef _Map::key_type zypp::MapKVIteratorTraits< _Map >::KeyType

The maps key type.

Definition at line 213 of file Iterator.h.

template<class _Map>

typedef transform_iterator<GetPairFirst<typename MapType::value_type>, typename MapType::const_iterator> zypp::MapKVIteratorTraits< _Map >::Key_const_iterator

The key iterator type.

Definition at line 216 of file Iterator.h.

template<class _Map>

typedef _Map::mapped_type zypp::MapKVIteratorTraits< _Map >::ValueType

The maps value (mapped) type.

Definition at line 218 of file Iterator.h.

template<class _Map>

typedef transform_iterator<GetPairSecond<typename MapType::value_type>, typename MapType::const_iterator> zypp::MapKVIteratorTraits< _Map >::Value_const_iterator

The value iterator type.

Definition at line 221 of file Iterator.h.

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The documentation for this struct was generated from the following file:

• zypp/base/Iterator.h

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