pair.hpp

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#pragma once
 
#include "indep/macro/helper.hpp"
#include "indep/macro/overload.hpp"
 
#define BY_PAIR_1(x) x
#define BY_PAIR_2(x, y) x, y
#define BY_PAIR_3(x, y, z) BY_PAIR_2(x, y), z
#define BY_PAIR_4(x, y, z, a) BY_PAIR_2(x, y), BY_PAIR_2(z, a)
#define BY_PAIR(...) BY_OVERLOAD(BY_PAIR, __VA_ARGS__)