util.h

/*
	Copyright (C) 2015 Matthew Lai

	Giraffe is free software: you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.
	
	Giraffe is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU General Public License for more details.
	
	You should have received a copy of the GNU General Public License
	along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef UTIL_H
#define UTIL_H

#include <chrono>
#include <fstream>
#include <regex>
#include <sstream>

#ifdef __GNUC_MINOR__
	#ifndef __llvm__
		#define GCC_VERSION (__GNUC__ * 10000 \
							   + __GNUC_MINOR__ * 100 \
							   + __GNUC_PATCHLEVEL__)
		#if GCC_VERSION < 40900
			#error GCC 4.9.0 is the minimum required to compile this code. \
			Earlier versions have broken <regex> and WILL break this code!
		#endif
	#endif
#endif

inline double CurrentTime() { //returns current time
	return static_cast<double>(
				std::chrono::duration_cast<std::chrono::microseconds>(
					std::chrono::system_clock::now().time_since_epoch()).count()) / 1000000.0;
}

inline bool PatternMatch(std::string str, std::string pattern_str)
{
	std::regex pattern(pattern_str, std::regex_constants::extended);
	return std::regex_match(str, pattern);
}

template <typename T>
inline std::string ToStr(const T &x)
{
	std::stringstream ss;
	ss << x;
	return ss.str();
}

inline bool FileReadable(const std::string &filename)
{
	std::ifstream infile(filename);

	return infile.good();
}

#endif // UTIL_H