| author | sl |
| Tue, 10 Jun 2014 14:32:02 +0200 | |
| changeset 1 | 260cb5ec6c19 |
| permissions | -rw-r--r-- |
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// Copyright 2002, Fernando Luis Cacciola Carballal. |
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// |
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// Distributed under the Boost Software License, Version 1.0. (See |
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// accompanying file LICENSE_1_0.txt or copy at |
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// http://www.boost.org/LICENSE_1_0.txt) |
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// |
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// 21 Ago 2002 (Created) Fernando Cacciola |
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// |
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#ifndef BOOST_UTILITY_VALUE_INIT_21AGO2002_HPP |
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#define BOOST_UTILITY_VALUE_INIT_21AGO2002_HPP |
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#include "boost/detail/select_type.hpp" |
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#include "boost/type_traits/cv_traits.hpp" |
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namespace boost {
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namespace vinit_detail {
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template<class T> |
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class const_T_base |
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{
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protected : |
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const_T_base() : x() {}
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T x ; |
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} ; |
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template<class T> |
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struct non_const_T_base |
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{
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protected : |
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non_const_T_base() : x() {}
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mutable T x ; |
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} ; |
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template<class T> |
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struct select_base |
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{
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typedef typename |
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boost::detail::if_true< ::boost::is_const<T>::value > |
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::template then< const_T_base<T>, non_const_T_base<T> >::type type ; |
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} ; |
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} // namespace vinit_detail |
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template<class T> |
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class value_initialized : private vinit_detail::select_base<T>::type |
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{
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public : |
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value_initialized() {}
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operator T&() const { return this->x ; }
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T& data() const { return this->x ; }
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} ; |
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template<class T> |
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T const& get ( value_initialized<T> const& x ) |
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{
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return x.data() ; |
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} |
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template<class T> |
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T& get ( value_initialized<T>& x ) |
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{
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return x.data() ; |
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} |
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} // namespace boost |
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#endif |
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