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