[ceph.git] / ceph / src / boost / boost / type_traits / conditional.hpp

//  (C) Copyright John Maddock 2010.  
//  Use, modification and distribution are subject to the Boost Software License,
//  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
//  http://www.boost.org/LICENSE_1_0.txt).
//
//  See http://www.boost.org/libs/type_traits for most recent version including documentation.


#ifndef BOOST_TT_CONDITIONAL_HPP_INCLUDED
#define BOOST_TT_CONDITIONAL_HPP_INCLUDED

#include <boost/config.hpp>

namespace boost {

template <bool b, class T, class U> struct conditional { typedef T type; };
template <class T, class U> struct conditional<false, T, U> { typedef U type; };

#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)

   template <bool b, class T, class U> using conditional_t = typename conditional<b, T, U>::type;

#endif

} // namespace boost


#endif // BOOST_TT_CONDITIONAL_HPP_INCLUDED
Commit	Line	Data
7c673cae FG	1	// (C) Copyright John Maddock 2010.
	2	// Use, modification and distribution are subject to the Boost Software License,
	3	// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
	4	// http://www.boost.org/LICENSE_1_0.txt).
	5	//
	6	// See http://www.boost.org/libs/type_traits for most recent version including documentation.
	7
	8
	9	#ifndef BOOST_TT_CONDITIONAL_HPP_INCLUDED
	10	#define BOOST_TT_CONDITIONAL_HPP_INCLUDED
	11
11fdf7f2 TL	12	#include <boost/config.hpp>
11fdf7f2 TL	13
7c673cae FG	14	namespace boost {
	15
	16	template <bool b, class T, class U> struct conditional { typedef T type; };
	17	template <class T, class U> struct conditional<false, T, U> { typedef U type; };
	18
b32b8144 FG	19	#if !defined(BOOST_NO_CXX11_TEMPLATE_ALIASES)
	20
	21	template <bool b, class T, class U> using conditional_t = typename conditional<b, T, U>::type;
	22
	23	#endif
	24
7c673cae FG	25	} // namespace boost
	26
	27
	28	#endif // BOOST_TT_CONDITIONAL_HPP_INCLUDED