sideFunc.hpp

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#pragma once
 
#include "indep/macro/overload.hpp"
 
#define BY_SIDE_FUNC_1(name) BY_SIDE_FUNC_2(it, name)
#define BY_SIDE_FUNC_2(paramPtr, name) BY_SIDE_FUNC_3(it, name(*it), decltype(name(*it))())
#define BY_SIDE_FUNC_3(paramPtr, expr, ret) \
    { return paramPtr ? expr : ret; }
 
#define BY_SIDE_FUNC(...) BY_OVERLOAD(BY_SIDE_FUNC, __VA_ARGS__)