Delegate.h

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/****
 * Sming Framework Project - Open Source framework for high efficiency native ESP8266 development.
 * Created 2015 by Skurydin Alexey
 * http://github.com/SmingHub/Sming
 * All files of the Sming Core are provided under the LGPL v3 license.
 *
 * Delegate.h
 *
 ****/
 
#pragma once
 
#include <functional>
using namespace std::placeholders;
 
template <typename> class Delegate; /* undefined */
 
template <typename ReturnType, typename... ParamTypes>
class Delegate<ReturnType(ParamTypes...)> : public std::function<ReturnType(ParamTypes...)>
{
    using StdFunc = std::function<ReturnType(ParamTypes...)>;
 
public:
    using StdFunc::function;
 
    Delegate() = default;
 
    template <class ClassType>
    Delegate(ReturnType (ClassType::*m)(ParamTypes...), ClassType* c)
        : StdFunc([m, c](ParamTypes... params) -> ReturnType { return (c->*m)(params...); })
    {
    }
};