/usr/include/sigx-2.0/sigx/const_trait.h is in libsigx-2.0-dev 2.0.2-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 | #ifndef _SIGX_CONST_TRAIT_HPP_
#define _SIGX_CONST_TRAIT_HPP_
/*
* Copyright 2006 Klaus Triendl
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
/*
* Inspired by Andrei Alexandrescu's article "volatile - Multithreaded
* Programmer's Best Friend":
* http://www.ddj.com/dept/cpp/184403766
*/
namespace sigx
{
/** @addtogroup threadsafety
* @{
*/
/** @short Traits for adding/removing the const qualifier from a type
*/
template<typename T_type>
struct const_trait
{
typedef const T_type add;
typedef T_type remove;
};
/** @short Specialization for const types
*/
template<typename T_type>
struct const_trait<const T_type>
{
typedef const T_type add;
typedef T_type remove;
};
/** @short Specialization for references to non-const types.
*
* Specializations for references do not consider a reference as a "top level"
* type qualifer unlike pointers; therefore, they add or remove the
* volatileness to/from the referenced type:
* const_trait<int&>::add -> const int&
* const_trait<int&>::remove -> int&
* const_trait<const int&>::add -> const int&
* const_trait<const int&>::remove -> int&
*
* (
* a different placing of the qualifier, same type:
* const_trait<int&>::add -> int const&
* const_trait<int&>::remove -> int&
* const_trait<int const&>::add -> int const&
* const_trait<int const&>::remove -> int&
* )
*
* whereas pointers themselves are treated like "top level" type qualifiers.
* Hence, they add or remove the volatileness from the pointer type qualifier:
* const_trait<int*>::add -> const int*
* const_trait<int*>::remove -> int*
* const_trait<const int*>::add -> const int*
* const_trait<const int*>::remove -> int*
* const_trait<int* const>::add -> int* const
* const_trait<int* const>::remove -> int*
*
* (
* a different placing of the qualifier, same type:
* const_trait<int*>::add -> int const*
* const_trait<int*>::remove -> int*
* const_trait<int const*>::add -> int const*
* const_trait<int const*>::remove -> int*
* const_trait<int* const>::add -> int* const
* const_trait<int* const>::remove -> int*
* )
*
* This is a major difference to boost::type_traits that consider a reference
* as a top level type qualifier
*/
template<typename T_type>
struct const_trait<T_type&>
{
typedef const T_type& add;
typedef T_type& remove;
};
/** @short Specialization for references to const types
*/
template<typename T_type>
struct const_trait<const T_type&>
{
typedef const T_type& add;
typedef T_type& remove;
};
// @addtogroup threadsafety
/** @}
*/
} // namespace sigx
#endif // end file guard
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