end.hpp

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#pragma once
 
#include "indep/common.hpp"
#include "indep/macro.hpp"
 
namespace by {
 
    class _nout end {
        BY(ME(end))
 
    public:
        end(std::function<void(void)> l);
        ~end();
 
    private:
        std::function<void(void)> _lambda;
    };
 
// e.g.
//  BY_END_BLOCK({
//      ....doSomething()
//  });
//      or,
//  BY_END(doSomething());
#define BY_END_BLOCK_2(__class, blockStmt) auto BY_CONCAT(__defer__, __COUNTER__) = __class(blockStmt)
#define BY_END_BLOCK_1(blockStmt) BY_END_BLOCK_2(end, [&]() blockStmt)
#define BY_END_BLOCK(...) BY_OVERLOAD(BY_END_BLOCK, __VA_ARGS__)
 
#define BY_END_2(__class, stmt) auto BY_CONCAT(__defer__, __COUNTER__) = __class(stmt)
#define BY_END_1(stmt) BY_END_2(end, ([&]() { stmt; }))
#define BY_END(...) BY_OVERLOAD(BY_END, __VA_ARGS__)
}