etl::select2nd< TPair > Struct Template Reference

Functor to select pair::second. More...

#include <utility.h>

Public Types
typedef TPair::second_type	type
	type of member pair::second.

Public Member Functions
type &	operator() (TPair &p) const
	Function call. The return value is p.second.
const type &	operator() (const TPair &p) const
	Function call. The return value is p.second.

Detailed Description

template<typename TPair>
struct etl::select2nd< TPair >

Functor to select pair::second.

select2nd is a functor object that takes a single argument, a pair, and returns the pair::second element. Example

      using Map    = std::map<int, double>;
      using Vector = std::vector<double>;
 
      const Map map = {{1, 0.3},
                       {47, 0.8},
                       {33, 0.1}};
      Vector    result{};
 
      // Extract the map values into a vector
      std::transform(map.begin(), map.end(), std::back_inserter(result), etl::select2nd<Map::value_type>());

Template Parameters

TPair

The function object's argument type.

See also

select1st

Member Function Documentation

operator()() [1/2]

template<typename TPair>

const type & etl::select2nd< TPair >::operator() ( const TPair & p ) const

inline

Function call. The return value is p.second.

Returns

a reference to member second of the pair p.

operator()() [2/2]

template<typename TPair>

type & etl::select2nd< TPair >::operator() ( TPair & p ) const

inline

Function call. The return value is p.second.

Returns

a reference to member second of the pair p.

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

• include/etl/utility.h