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acl/lib_acl_cpp/samples/util.cpp

21 lines
436 B
C++

#include "stdafx.h"
#include <string.h>
#include <time.h>
#include "util.h"
double util::stamp_sub(const struct timeval *from, const struct timeval *sub_by)
{
struct timeval res;
memcpy(&res, from, sizeof(struct timeval));
res.tv_usec -= sub_by->tv_usec;
if (res.tv_usec < 0) {
--res.tv_sec;
res.tv_usec += 1000000;
}
res.tv_sec -= sub_by->tv_sec;
return (res.tv_sec * 1000.0 + res.tv_usec/1000.0);
}