ceph/src/boost/libs/log/include/boost/log/detail/deduce_char_type.hpp

   1 /*
   2  *          Copyright Andrey Semashev 2007 - 2015.
   3  * Distributed under the Boost Software License, Version 1.0.
   4  *    (See accompanying file LICENSE_1_0.txt or copy at
   5  *          http://www.boost.org/LICENSE_1_0.txt)
   6  */
   7 /*!
   8  * \file   deduce_char_type.hpp
   9  * \author Andrey Semashev
  10  * \date   17.11.2012
  11  *
  12  * \brief  This header is the Boost.Log library implementation, see the library documentation
  13  *         at http://www.boost.org/doc/libs/release/libs/log/doc/html/index.html.
  14  */
  15
  16 #ifndef BOOST_LOG_DETAIL_DEDUCE_CHAR_TYPE_HPP_INCLUDED_
  17 #define BOOST_LOG_DETAIL_DEDUCE_CHAR_TYPE_HPP_INCLUDED_
  18
  19 #include <boost/log/detail/config.hpp>
  20 #include <boost/log/detail/header.hpp>
  21
  22 #ifdef BOOST_HAS_PRAGMA_ONCE
  23 #pragma once
  24 #endif
  25
  26 namespace boost {
  27
  28 BOOST_LOG_OPEN_NAMESPACE
  29
  30 namespace aux {
  31
  32 template< typename T >
  33 struct deduced_char_type;
  34
  35 template< >
  36 struct deduced_char_type< char >
  37 {
  38     typedef char type;
  39 };
  40
  41 template< >
  42 struct deduced_char_type< const char >
  43 {
  44     typedef char type;
  45 };
  46
  47 template< >
  48 struct deduced_char_type< wchar_t >
  49 {
  50     typedef wchar_t type;
  51 };
  52
  53 template< >
  54 struct deduced_char_type< const wchar_t >
  55 {
  56     typedef wchar_t type;
  57 };
  58
  59 //! Auxiliary traits to detect character type from a string
  60 template< typename RangeT >
  61 struct deduce_char_type :
  62     public deduced_char_type< typename RangeT::value_type >
  63 {
  64 };
  65
  66 template< typename T >
  67 struct deduce_char_type< T* > :
  68     public deduced_char_type< T >
  69 {
  70 };
  71
  72 template< typename T >
  73 struct deduce_char_type< T* const > :
  74     public deduced_char_type< T >
  75 {
  76 };
  77
  78 template< typename T, unsigned int CountV >
  79 struct deduce_char_type< T[CountV] > :
  80     public deduced_char_type< T >
  81 {
  82 };
  83
  84 template< typename T >
  85 struct deduce_char_type< T& > :
  86     public deduce_char_type< T >
  87 {
  88 };
  89
  90 #if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
  91
  92 template< typename T >
  93 struct deduce_char_type< T&& > :
  94     public deduce_char_type< T >
  95 {
  96 };
  97
  98 #endif
  99
 100 } // namespace aux
 101
 102 BOOST_LOG_CLOSE_NAMESPACE // namespace log
 103
 104 } // namespace boost
 105
 106 #include <boost/log/detail/footer.hpp>
 107
 108 #endif // BOOST_LOG_DETAIL_DEDUCE_CHAR_TYPE_HPP_INCLUDED_