github.com/searKing/golang/go@v1.2.74/os/signal/cgo/include/boost/core/swap.hpp (about)

     1  // Copyright (C) 2007, 2008 Steven Watanabe, Joseph Gauterin, Niels Dekker
     2  //
     3  // Distributed under the Boost Software License, Version 1.0. (See
     4  // accompanying file LICENSE_1_0.txt or copy at
     5  // http://www.boost.org/LICENSE_1_0.txt)
     6  // For more information, see http://www.boost.org
     7  
     8  
     9  #ifndef BOOST_CORE_SWAP_HPP
    10  #define BOOST_CORE_SWAP_HPP
    11  
    12  // Note: the implementation of this utility contains various workarounds:
    13  // - swap_impl is put outside the boost namespace, to avoid infinite
    14  // recursion (causing stack overflow) when swapping objects of a primitive
    15  // type.
    16  // - swap_impl has a using-directive, rather than a using-declaration,
    17  // because some compilers (including MSVC 7.1, Borland 5.9.3, and
    18  // Intel 8.1) don't do argument-dependent lookup when it has a
    19  // using-declaration instead.
    20  // - boost::swap has two template arguments, instead of one, to
    21  // avoid ambiguity when swapping objects of a Boost type that does
    22  // not have its own boost::swap overload.
    23  
    24  #include <boost/core/enable_if.hpp>
    25  #include <boost/config.hpp>
    26  #include <utility> //for std::swap (C++11)
    27  #include <algorithm> //for std::swap (C++98)
    28  #include <cstddef> //for std::size_t
    29  
    30  namespace boost_swap_impl
    31  {
    32    // we can't use type_traits here
    33  
    34    template<class T> struct is_const { enum _vt { value = 0 }; };
    35    template<class T> struct is_const<T const> { enum _vt { value = 1 }; };
    36  
    37    template<class T>
    38    BOOST_GPU_ENABLED
    39    void swap_impl(T& left, T& right)
    40    {
    41      using namespace std;//use std::swap if argument dependent lookup fails
    42      swap(left,right);
    43    }
    44  
    45    template<class T, std::size_t N>
    46    BOOST_GPU_ENABLED
    47    void swap_impl(T (& left)[N], T (& right)[N])
    48    {
    49      for (std::size_t i = 0; i < N; ++i)
    50      {
    51        ::boost_swap_impl::swap_impl(left[i], right[i]);
    52      }
    53    }
    54  }
    55  
    56  namespace boost
    57  {
    58    template<class T1, class T2>
    59    BOOST_GPU_ENABLED
    60    typename enable_if_c< !boost_swap_impl::is_const<T1>::value && !boost_swap_impl::is_const<T2>::value >::type
    61    swap(T1& left, T2& right)
    62    {
    63      ::boost_swap_impl::swap_impl(left, right);
    64    }
    65  }
    66  
    67  #endif