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(blockStmt) auto __defer__##__COUNTER__ = end([&]() blockStmt)
#define BY_END(stmt) auto __defer__##__COUNTER__ = end([&]() { stmt; })
}