/usr/include/sigc++-2.0/sigc++/reference_wrapper.h is in libsigc++-2.0-dev 2.10.0-2.
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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 | /*
* Copyright 2002, The libsigc++ Development Team
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#ifndef _SIGC_REFERENCE_WRAPPER_H_
#define _SIGC_REFERENCE_WRAPPER_H_
#include <functional> // For std::reference_wrapper.
namespace sigc {
#ifndef SIGCXX_DISABLE_DEPRECATED
/** Reference wrapper.
* Use sigc::ref() to create a reference wrapper.
*
* @deprecated Use std::ref() or std::cref() instead to create a std::reference_wrapper().
*/
template <class T_type>
struct reference_wrapper
{
explicit reference_wrapper(T_type& v)
: value_(v) {}
operator T_type& () const
{ return value_; }
T_type& value_;
};
/** Const reference wrapper.
* Use sigc::ref() to create a const reference wrapper.
*
* @deprecated Use std::ref() or std::cref() instead to create a std::reference_wrapper().
*/
template <class T_type>
struct const_reference_wrapper
{
explicit const_reference_wrapper(const T_type& v)
: value_(v) {}
operator const T_type& () const
{ return value_; }
const T_type& value_;
};
/** Creates a reference wrapper.
* Passing an object throught sigc::ref() makes libsigc++ adaptors
* like, e.g., sigc::bind store references to the object instead of copies.
* If the object type inherits from sigc::trackable this will ensure
* automatic invalidation of the adaptors when the object is deleted
* or overwritten.
*
* @param v Reference to store.
* @return A reference wrapper.
*
* @deprecated Use std::ref() or std::cref() instead.
*/
template <class T_type>
reference_wrapper<T_type> ref(T_type& v)
{ return reference_wrapper<T_type>(v); }
/** Creates a const reference wrapper.
* Passing an object throught sigc::ref() makes libsigc++ adaptors
* like, e.g., sigc::bind store references to the object instead of copies.
* If the object type inherits from sigc::trackable this will ensure
* automatic invalidation of the adaptors when the object is deleted
* or overwritten.
*
* @param v Reference to store.
* @return A reference wrapper.
*
* @deprecated Use std::ref() or std::cref() instead.
*/
template <class T_type>
const_reference_wrapper<T_type> ref(const T_type& v)
{ return const_reference_wrapper<T_type>(v); }
#endif // SIGCXX_DISABLE_DEPRECATED
template <class T_type>
struct unwrap_reference
{
typedef T_type type;
};
#ifndef SIGCXX_DISABLE_DEPRECATED
// Specializations for std::reference_wrapper and std::const_reference_wrapper:
template <class T_type>
struct unwrap_reference<reference_wrapper<T_type> >
{
typedef T_type& type;
};
template <class T_type>
struct unwrap_reference<const_reference_wrapper<T_type> >
{
typedef const T_type& type;
};
template <class T_type>
T_type& unwrap(const reference_wrapper<T_type>& v)
{ return v; }
template <class T_type>
const T_type& unwrap(const const_reference_wrapper<T_type>& v)
{ return v; }
#endif // SIGCXX_DISABLE_DEPRECATED
//Specializations for std::reference_wrapper:
template <class T_type>
struct unwrap_reference<std::reference_wrapper<T_type> >
{
typedef T_type& type;
};
template <class T_type>
T_type& unwrap(const std::reference_wrapper<T_type>& v)
{ return v; }
} /* namespace sigc */
#endif /* _SIGC_REFERENCE_WRAPPER_H_ */
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