ref.h

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#ifndef STD_REF_H
#define STD_REF_H
 
#pragma once
 
// ============================================================
// 公共包含部分
// 自动导入引用包装库
// ============================================================
 
// VC9.0 SP1以上分支判断
#if defined(_MSC_VER) && ((_MSC_VER == 1500 && defined(_HAS_TR1)) || _MSC_VER > 1500)
// 采用VC std::tr1库
#  include <functional>
#elif defined(__clang__) && __clang_major__ >= 3
// 采用Clang c++11库
#  include <functional>
#elif defined(__GNUC__) && __GNUC__ >= 4
// 采用G++ std::tr1库
#  if __cplusplus >= 201103L || defined(__GXX_EXPERIMENTAL_CXX0X__)
#    include <functional>
#  else
#    include <tr1/functional>
namespace std {
using tr1::cref;
using tr1::ref;
using tr1::reference_wrapper;
}  // namespace std
#  endif
#else
// 采用boost tr1库
#  include <boost/tr1/functional.hpp>
namespace std {
using tr1::cref;
using tr1::ref;
using tr1::reference_wrapper;
}  // namespace std
#endif
 
#endif