utils.h

#ifndef __UTILS__
#define __UTILS__

#include <unistd.h>
#include <sys/time.h>
#include <iostream>
#include <fstream>
#include <cstdlib>

double PIL_check_seconds_timer(void) 
{
	struct timeval tv;
	struct timezone tz;

	gettimeofday(&tv, &tz);

	return ((double) tv.tv_sec + tv.tv_usec / 1000000.0);
}

long int PIL_check_seconds_timer_i(void)
{
	struct timeval tv;
	struct timezone tz;

	gettimeofday(&tv, &tz);

	return tv.tv_sec;
}

void PIL_sleep_ms(int ms)
{
	if (ms >= 1000) {
		sleep(ms / 1000);
		ms = (ms % 1000);
	}
	
	usleep(ms * 1000);
}

static int time_identation = 0;

#define STRINGIFY_APPEND(a, b) "" a #b
#define STRINGIFY(x) STRINGIFY_APPEND("", x)
#define AT __FILE__ ":" STRINGIFY(__LINE__)

#define TIME_TAB                                                          \
		for (int _i = 0; _i < time_identation; _i++) {                        \
			printf("\t");                                                       \
		}

#define TIMEIT_START(var)                                                 \
	{                                                                       \
		time_identation ++;                                                   \
		TIME_TAB                                                              \
		double _timeit_##var = PIL_check_seconds_timer();                     \
		printf("time start \t " AT "\t(" #var "): \t%5s--\n", "-");           \
		fflush(stdout);                                                       \
		{ (void)0

/**
 * \return the time since TIMEIT_START was called.
 */
#define TIMEIT_VALUE(var) (float)(PIL_check_seconds_timer() - _timeit_##var) * 1000.0f

#define TIMEIT_VALUE_PRINT(var)                                                 \
	{                                                                             \
		TIME_TAB                                                                    \
		printf("time update \t " AT "\t(" #var "): \t%5.fms\n", TIMEIT_VALUE(var)); \
		fflush(stdout);                                                             \
	} (void)0

#define TIMEIT_END(var)                                                         \
		}                                                                           \
		TIME_TAB                                                                    \
		printf("time end \t " AT "\t(" #var "): \t%5.fms\n", TIMEIT_VALUE(var));    \
		fflush(stdout);                                                             \
		time_identation--;                                                          \
	} (void)0

bool readFileIntoString( const std::string &fileName, std::string &destination ) {
    std::ifstream in( fileName, std::ios::in | std::ios::binary );
    if ( in ) {
        in.seekg( 0, std::ios::end );
        destination.resize( in.tellg() );
        in.seekg( 0, std::ios::beg );
        in.read( &destination[ 0 ], destination.size() );
        in.close();
        return true;
    }
    return false;
}

#endif /* __UTILS__ */