Chris@16: //////////////////////////////////////////////////////////////////////////////
Chris@16: //
Chris@16: // (C) Copyright Ion Gaztanaga 2005-2012.
Chris@16: //
Chris@16: // Distributed under the Boost Software License, Version 1.0.
Chris@16: // (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: // http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // See http://www.boost.org/libs/interprocess for documentation.
Chris@16: //
Chris@16: //////////////////////////////////////////////////////////////////////////////
Chris@16: 
Chris@16: #ifndef BOOST_INTERPROCESS_DETAIL_MPL_HPP
Chris@16: #define BOOST_INTERPROCESS_DETAIL_MPL_HPP
Chris@16: 
Chris@101: #ifndef BOOST_CONFIG_HPP
Chris@101: #  include <boost/config.hpp>
Chris@101: #endif
Chris@101: #
Chris@101: #if defined(BOOST_HAS_PRAGMA_ONCE)
Chris@16: #  pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <cstddef>
Chris@16: 
Chris@16: namespace boost {
Chris@16: namespace interprocess {
Chris@16: namespace ipcdetail {
Chris@16: 
Chris@16: template <class T, T val>
Chris@16: struct integral_constant
Chris@16: {
Chris@16:    static const T value = val;
Chris@16:    typedef integral_constant<T,val> type;
Chris@16: };
Chris@16: 
Chris@16: template< bool C_ >
Chris@16: struct bool_ : integral_constant<bool, C_>
Chris@16: {
Chris@16:    static const bool value = C_;
Chris@16: };
Chris@16: 
Chris@16: typedef bool_<true>        true_;
Chris@16: typedef bool_<false>       false_;
Chris@16: 
Chris@16: typedef true_  true_type;
Chris@16: typedef false_ false_type;
Chris@16: 
Chris@16: typedef char yes_type;
Chris@16: struct no_type
Chris@16: {
Chris@16:    char padding[8];
Chris@16: };
Chris@16: 
Chris@16: template <bool B, class T = void>
Chris@16: struct enable_if_c {
Chris@16:   typedef T type;
Chris@16: };
Chris@16: 
Chris@16: template <class T>
Chris@16: struct enable_if_c<false, T> {};
Chris@16: 
Chris@16: template <class Cond, class T = void>
Chris@16: struct enable_if : public enable_if_c<Cond::value, T> {};
Chris@16: 
Chris@16: template <class Cond, class T = void>
Chris@16: struct disable_if : public enable_if_c<!Cond::value, T> {};
Chris@16: 
Chris@16: template <class T, class U>
Chris@16: class is_convertible
Chris@16: {
Chris@16:    typedef char true_t;
Chris@16:    class false_t { char dummy[2]; };
Chris@16:    static true_t dispatch(U);
Chris@16:    static false_t dispatch(...);
Chris@16:    static T trigger();
Chris@16:    public:
Chris@16:    static const bool value = sizeof(dispatch(trigger())) == sizeof(true_t);
Chris@16: };
Chris@16: 
Chris@16: template<
Chris@16:       bool C
Chris@16:     , typename T1
Chris@16:     , typename T2
Chris@16:     >
Chris@16: struct if_c
Chris@16: {
Chris@16:     typedef T1 type;
Chris@16: };
Chris@16: 
Chris@16: template<
Chris@16:       typename T1
Chris@16:     , typename T2
Chris@16:     >
Chris@16: struct if_c<false,T1,T2>
Chris@16: {
Chris@16:     typedef T2 type;
Chris@16: };
Chris@16: 
Chris@16: template<
Chris@16:       typename T1
Chris@16:     , typename T2
Chris@16:     , typename T3
Chris@16:     >
Chris@16: struct if_
Chris@16: {
Chris@16:    typedef typename if_c<0 != T1::value, T2, T3>::type type;
Chris@16: };
Chris@16: 
Chris@16: 
Chris@16: template <class Pair>
Chris@16: struct select1st
Chris@16: //   : public std::unary_function<Pair, typename Pair::first_type>
Chris@16: {
Chris@16:    template<class OtherPair>
Chris@16:    const typename Pair::first_type& operator()(const OtherPair& x) const
Chris@16:    {  return x.first;   }
Chris@16: 
Chris@16:    const typename Pair::first_type& operator()(const typename Pair::first_type& x) const
Chris@16:    {  return x;   }
Chris@16: };
Chris@16: 
Chris@16: // identity is an extension: it is not part of the standard.
Chris@16: template <class T>
Chris@16: struct identity
Chris@16: //   : public std::unary_function<T,T>
Chris@16: {
Chris@16:    typedef T type;
Chris@16:    const T& operator()(const T& x) const
Chris@16:    { return x; }
Chris@16: };
Chris@16: 
Chris@16: template<std::size_t S>
Chris@16: struct ls_zeros
Chris@16: {
Chris@16:    static const std::size_t value = (S & std::size_t(1)) ? 0 : (1u + ls_zeros<(S >> 1u)>::value);
Chris@16: };
Chris@16: 
Chris@16: template<>
Chris@16: struct ls_zeros<0>
Chris@16: {
Chris@16:    static const std::size_t value = 0;
Chris@16: };
Chris@16: 
Chris@16: template<>
Chris@16: struct ls_zeros<1>
Chris@16: {
Chris@16:    static const std::size_t value = 0;
Chris@16: };
Chris@16: 
Chris@16: }  //namespace ipcdetail {
Chris@16: }  //namespace interprocess {
Chris@16: }  //namespace boost {
Chris@16: 
Chris@16: #endif   //#ifndef BOOST_INTERPROCESS_DETAIL_MPL_HPP
Chris@16: