debug.hpp
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	#pragma once

	#ifndef NPDEBUG
	#define NPDEBUG

	#ifdef DEBUG
	#include <iostream>
	#include <sstream>

	#define __FILENAME__ (\
	__builtin_strrchr(__FILE__, '/') ? \
	__builtin_strrchr(__FILE__, '/') + 1 : __FILE__)

	#define npdebug(...); { \
	std::cerr << "[" << __FILENAME__ \
	<< ":" << __LINE__ \
	<< ", " << __func__ \
	<< "] " ; \
	_np::debug(__VA_ARGS__); \
	}

	#define npinspect(msg, expr, ...); _np::inspect(msg, expr, __VA_ARGS__);

	namespace _np {
	template<typename... Args>
	inline void debug(const Args&... args) {
	(std::cerr << ... << args) << std::endl;
	}

	template<typename Msg, typename Expr, typename... Args>
	inline Expr& inspect(const Msg& msg, Expr& expr, const Args&... args) {
	npdebug(msg, expr, args...);
	return expr;
	}
	}

	#else

	#define npdebug(...); {}
	#define npinspect(...); {}

	namespace _np {
	template<typename... Args>
	void debug(Args&... args) {}

	template<typename Msg, typename Expr, typename... Args>
	inline Expr& inspect(const Msg& msg, Expr& expr, const Args&... args) {
	return expr;
	}
	}

	#endif // defined DEBUG
	#endif // not defined NPDEBUG