[%] 이 매크로 작동되는 원리가 뭐냐?

[ㅇㅇㅇ(210.126)]

가변 매크로 부분만 인터넷에서 퍼왔는데 왜 작동되는지 모르겟다.

#define Assert_1(condition) Trace::_Assert(__LINE__, __FILE__, condition)

#define Assert_2(condition,message) Trace::_Assert(__LINE__, __FILE__, condition, message)

#define _GET_OVERRIDE(_1, _2, NAME, ...) NAME

#define Assert(...) _GET_OVERRIDE(__VA_ARGS__, Assert_2, Assert_1)(__VA_ARGS__)

class Trace

{

private:

static bool _Debug;

public:

static void Write(const std::string& message);

static void WriteLine(const std::string& message);

static void Write(const std::string& message, const std::string& category);

static void WriteLine(const std::string& message, const std::string& category);

public:

static void _Assert(const int& line, const std::string& file, const bool& condition);

static void _Assert(const int& line, const std::string& file, const bool& condition, const std::string& message);

};