166 lines
6.1 KiB
C
166 lines
6.1 KiB
C
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///\file
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/******************************************************************************
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The MIT License(MIT)
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Embedded Template Library.
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https://github.com/ETLCPP/etl
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https://www.etlcpp.com
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Copyright(c) 2017 John Wellbelove
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files(the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions :
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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******************************************************************************/
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#ifndef ETL_PACKET_INCLUDED
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#define ETL_PACKET_INCLUDED
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#include "platform.h"
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#include "static_assert.h"
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#include "alignment.h"
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#include "utility.h"
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#include "placement_new.h"
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//*****************************************************************************
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///\defgroup packet packet
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/// A class that can contain one a several related types.
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///\ingroup containers
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//*****************************************************************************
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namespace etl
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{
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//***************************************************************************
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/// A template class that can store any types derived from TBase that conform
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/// to the size and alignment requirements.
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///\ingroup packet
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//***************************************************************************
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template <typename TBase, size_t SIZE, size_t ALIGNMENT>
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class packet
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{
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public:
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typedef TBase base_t;
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#if ETL_USING_CPP11
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//***************************************************************************
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/// Constructor that static asserts any types that do not conform to the max size and alignment.
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//***************************************************************************
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template <typename T>
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explicit packet(T&& value)
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{
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typedef typename etl::types<T>::type type;
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ETL_STATIC_ASSERT((etl::is_base_of<TBase, type>::value), "Unsupported type");
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ETL_STATIC_ASSERT(sizeof(type) <= SIZE, "Unsupported size");
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ETL_STATIC_ASSERT(etl::alignment_of<type>::value <= ALIGNMENT, "Unsupported alignment");
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::new (static_cast<type*>(data)) type(etl::forward<T>(value));
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}
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#else
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//***************************************************************************
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/// Constructor that static asserts any types that do not conform to the max size and alignment.
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//***************************************************************************
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template <typename T>
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explicit packet(const T& value)
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{
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ETL_STATIC_ASSERT((etl::is_base_of<TBase, T>::value), "Unsupported type");
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ETL_STATIC_ASSERT(sizeof(T) <= SIZE, "Unsupported size");
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ETL_STATIC_ASSERT(etl::alignment_of<T>::value <= ALIGNMENT, "Unsupported alignment");
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::new (static_cast<T*>(data)) T(value);
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}
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#endif
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//***************************************************************************
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/// Destructor
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//***************************************************************************
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~packet()
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{
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static_cast<TBase*>(data)->~TBase();
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}
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#if ETL_USING_CPP11
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//***************************************************************************
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/// Assignment operator for type.
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///\param value The value to assign.
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//***************************************************************************
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template <typename T>
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packet& operator =(T&& value)
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{
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typedef typename etl::types<T>::type type;
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ETL_STATIC_ASSERT((etl::is_base_of<TBase, type>::value), "Unsupported type");
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ETL_STATIC_ASSERT(sizeof(type) <= SIZE, "Unsupported size");
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ETL_STATIC_ASSERT(etl::alignment_of<type>::value <= ALIGNMENT, "Unsupported alignment");
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static_cast<TBase*>(data)->~TBase();
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::new (static_cast<type*>(data)) type(etl::forward<T>(value));
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return *this;
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}
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#else
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//***************************************************************************
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/// Assignment operator for type.
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///\param value The value to assign.
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//***************************************************************************
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template <typename T>
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packet& operator =(const T& value)
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{
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ETL_STATIC_ASSERT((etl::is_base_of<TBase, T>::value), "Unsupported type");
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ETL_STATIC_ASSERT(sizeof(T) <= SIZE, "Unsupported size");
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ETL_STATIC_ASSERT(etl::alignment_of<T>::value <= ALIGNMENT, "Unsupported alignment");
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static_cast<TBase*>(data)->~TBase();
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::new (static_cast<T*>(data)) T(value);
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return *this;
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}
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#endif
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//***************************************************************************
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/// Get access to the contained object.
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//***************************************************************************
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TBase& get()
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{
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return *static_cast<TBase*>(data);
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}
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//***************************************************************************
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/// Get access to the contained object.
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//***************************************************************************
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const TBase& get() const
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{
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return *static_cast<const TBase*>(data);
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}
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private:
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packet(const packet& other);
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packet& operator =(const packet& other);
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//***************************************************************************
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/// The internal storage.
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/// Aligned on a suitable boundary, which should be good for all types.
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//***************************************************************************
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typename etl::aligned_storage<SIZE, ALIGNMENT>::type data;
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};
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}
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#endif
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