forked from enlightenment/efl
93 lines
1.8 KiB
C++
93 lines
1.8 KiB
C++
/*
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* Copyright 2019 by its authors. See AUTHORS.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef EINA_REF_HH
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#define EINA_REF_HH
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#include <functional>
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/**
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* @addtogroup Eina_Cxx_Tools_Group
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*
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* @{
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*/
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namespace efl { namespace eina {
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/**
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* @defgroup Eina_Cxx_Ref_Group Reference Wrapper
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* @ingroup Eina_Cxx_Tools_Group
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*
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* @{
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*/
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/**
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* @brief Creates a @c reference_wrapper to the given object.
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* @return @c reference_wrapper holding a reference to the given object.
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*
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* Creates the appropriate reference_wrapper type to hold a reference to
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* the given object. If the argument is itself a @c reference_wrapper,
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* it creates a copy of it instead.
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*/
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using std::ref;
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/**
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* @brief Creates a @c reference_wrapper to the given object.
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* @return @c reference_wrapper holding a reference to the given object.
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*
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* Specialized version of @ref ref for @c reference_wrapper to constant
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* types.
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*/
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using std::cref;
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/**
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* Class that wraps a reference in a copyable, assignable object.
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*/
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using std::reference_wrapper;
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/**
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* Get a reference from a @c reference_wrapper. If @p t is already a
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* reference just return a reference to @p t.
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*
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* @{
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*/
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template <typename T>
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T& unref(T& t)
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{
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return t;
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}
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template <typename T>
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T& unref(reference_wrapper<T> t)
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{
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return t.get();
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}
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/**
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* @}
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*/
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/**
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* @}
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*/
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}}
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/**
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* @}
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*/
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#endif
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