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  1.  
  2.     #include <time.h>
  3.     #include <sys/time.h>
  4.     #include <stdlib.h>
  5.     #include <stdio.h>
  6.     #include <math.h>
  7.     #include <cctype>
  8.     #include <algorithm>
  9.     #include <cstring>
  10.  
  11.     /* Return 1 if the difference is negative, otherwise 0.  */
  12.     int timeval_subtract(struct timeval *result, struct timeval *t2, struct timeval *t1)
  13.     {
  14.     	long int diff = (t2->tv_usec + 1000000 * t2->tv_sec) - (t1->tv_usec + 1000000 * t1->tv_sec);
  15.     	result->tv_sec = diff / 1000000;
  16.     	result->tv_usec = diff % 1000000;
  17.  
  18.     	return (diff<0);
  19.     }
  20.  
  21.     void timeval_print(struct timeval *tv)
  22.     {
  23.     	char buffer[30];
  24.     	time_t curtime;
  25.  
  26.     	printf("%ld.%06ld", tv->tv_sec, tv->tv_usec);
  27.     	curtime = tv->tv_sec;
  28.     	strftime(buffer, 30, "%m-%d-%Y  %T", localtime(&curtime));
  29.     	printf(" = %s.%06ld\n", buffer, tv->tv_usec);
  30.     }
  31.  
  32.     bool is_char_category_in_question(const char& c) {
  33.         return std::ispunct(c) || std::isspace(c);
  34.     }
  35.  
  36.     int main()
  37.     {
  38.     	struct timeval tvBegin, tvEnd, tvDiff;
  39.  
  40.     	// begin
  41.     	gettimeofday(&tvBegin, NULL);
  42.     	timeval_print(&tvBegin);
  43.  
  44.         static char str1[100] = "str,, ing";
  45.         size_t size = strlen(str1);
  46.  
  47.     	// lengthy operation
  48.     	int i,j;
  49.     	for(i=0;i<999999L;++i) {
  50.     		std::remove_if(&str1[0], &str1[size-1], is_char_category_in_question);
  51.     	}
  52.  
  53.     	//end
  54.     	gettimeofday(&tvEnd, NULL);
  55.     	timeval_print(&tvEnd);
  56.  
  57.     	// diff
  58.     	timeval_subtract(&tvDiff, &tvEnd, &tvBegin);
  59.     	printf("%ld.%06ld\n", tvDiff.tv_sec, tvDiff.tv_usec);
  60.  
  61.     	return 0;
  62.     }
  63.  
Success #stdin #stdout 0.2s 2860KB
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1392336454.110571 = 02-14-2014  00:07:34.110571
1392336454.317305 = 02-14-2014  00:07:34.317305
0.206734
https://ideone.com/rp5NxA
language:
C++ 4.3.2 (gcc-4.3.2)
created:
10 years ago
visibility:
public

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