forked from boostorg/mpl
49 lines
1.4 KiB
C++
49 lines
1.4 KiB
C++
//-----------------------------------------------------------------------------
|
|
// boost mpl/select1st.hpp header file
|
|
// See http://www.boost.org for updates, documentation, and revision history.
|
|
//-----------------------------------------------------------------------------
|
|
//
|
|
// Copyright (c) 2000-02
|
|
// Aleksey Gurtovoy
|
|
//
|
|
// Permission to use, copy, modify, distribute and sell this software
|
|
// and its documentation for any purpose is hereby granted without fee,
|
|
// provided that the above copyright notice appears in all copies and
|
|
// that both the copyright notice and this permission notice appear in
|
|
// supporting documentation. No representations are made about the
|
|
// suitability of this software for any purpose. It is provided "as is"
|
|
// without express or implied warranty.
|
|
|
|
#ifndef BOOST_MPL_SELECT1ST_HPP_INCLUDED
|
|
#define BOOST_MPL_SELECT1ST_HPP_INCLUDED
|
|
|
|
#include "boost/mpl/aux_/void_spec.hpp"
|
|
#include "boost/mpl/aux_/lambda_support.hpp"
|
|
#include "boost/mpl/aux_/config/eti.hpp"
|
|
|
|
namespace boost {
|
|
namespace mpl {
|
|
|
|
template<
|
|
typename BOOST_MPL_AUX_VOID_SPEC_PARAM(Pair)
|
|
>
|
|
struct select1st
|
|
{
|
|
typedef typename Pair::first type;
|
|
BOOST_MPL_AUX_LAMBDA_SUPPORT(1,select1st,(Pair))
|
|
};
|
|
|
|
#if defined(BOOST_MPL_MSVC_ETI_BUG)
|
|
template<> struct select1st<int>
|
|
{
|
|
typedef select1st<int> type;
|
|
};
|
|
#endif
|
|
|
|
BOOST_MPL_AUX_VOID_SPEC(1, select1st)
|
|
|
|
} // namespace mpl
|
|
} // namespace boost
|
|
|
|
#endif // BOOST_MPL_SELECT1ST_HPP_INCLUDED
|