virtual.h

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//   Copyright 2016-2022 Jean-Francois Poilpret
//
//   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 VIRTUAL_HH
#define VIRTUAL_HH
 
#include <stddef.h>
#include <stdint.h>
 
namespace virtual_support
{
    class VirtualMethod
    {
    public:
        VirtualMethod(const VirtualMethod&) = default;
        VirtualMethod& operator=(const VirtualMethod&) = default;
        
        using METHOD = void (*)(void*);
 
        explicit VirtualMethod(METHOD method = nullptr, void* arg = nullptr): method_{method}, arg_{arg} {}
 
        void operator()() const
        {
            if (method_ != nullptr)
                method_(arg_);
        }
    
    private:
        const METHOD method_;
        void* const arg_;
    };
 
}
 
#endif /* VIRTUAL_HH */