82 lines
2.5 KiB
C
82 lines
2.5 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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http://www.etlcpp.com
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Copyright(c) 2015 jwellbelove
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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_CALLBACK__
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#define __ETL_CALLBACK__
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namespace etl
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{
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//***************************************************************************
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/// A callback class designed to be multiply inherited by other client classes.
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/// The class is parametrised with a callback parameter type and a unique id.
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/// The unique id allows multiple callbacks with the same parameter type.
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///\tparam TParameter The callback parameter type.
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///\tparam ID The unique id for this callback.
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//***************************************************************************
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template <typename TParameter, const int ID>
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class callback
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{
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private:
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// Creates a parameter type unique to this ID.
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template <typename T, const int I>
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struct parameter
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{
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parameter(T value_)
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: value(value_)
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{
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}
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typedef T value_type;
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T value;
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private:
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parameter();
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};
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// Specialisation for void.
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template <const int I>
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struct parameter<void, I>
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{
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typedef void value_type;
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};
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public:
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typedef parameter<TParameter, ID> type;
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virtual void etl_callback(type p = type()) = 0;
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};
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}
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#endif
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