theplu::yat::utility::PairFirst< Pair > Struct Template Reference

Functor that return std::pair.first. More...

#include <yat/utility/stl_utility.h>

Public Types
typedef boost::mpl::if_< typename boost::is_const< Pair >::type, typename boost::add_const< typename Pair::first_type >::type &, typename Pair::first_type & >::type	result_type
typedef Pair &	argument_type

Public Member Functions
result_type	operator() (argument_type p) const

Detailed Description

template<class Pair>
struct theplu::yat::utility::PairFirst< Pair >

Functor that return std::pair.first.

See also

pair_first_iterator

Since

New in yat 0.5

Member Typedef Documentation

argument_type

template<class Pair >

typedef Pair& theplu::yat::utility::PairFirst< Pair >::argument_type

The argument type is Pair&.

result_type

template<class Pair >

typedef boost::mpl::if_< typename boost::is_const<Pair>::type, typename boost::add_const<typename Pair::first_type>::type&, typename Pair::first_type&>::type theplu::yat::utility::PairFirst< Pair >::result_type

The type returned is Pair::first_type& with the exception when Pair is const and Pair::first_type is non-const, in which case const Pair::first_type& is return type.

Member Function Documentation

operator()()

template<class Pair >

result_type theplu::yat::utility::PairFirst< Pair >::operator() ( argument_type  p ) const

inline

Returns

p.first

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

• yat/utility/stl_utility.h