hello-cpp/test.cc at master · ahupowerdns/hello-cpp · GitHub

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#include <algorithm>
#include <vector>
#include <parallel/algorithm>
#include <memory>

int cmp(const void* a, const void* b)
{
  if(*(int*)a < *(int*)b)
    return -1;
  else if(*(int*)a > *(int*)b)
    return 1;
  else
    return 0;

}

void func()
{
	FILE *fp = fopen("/etc/passwd", "r");
	if(!fp)
	  ; // do error things
	std::shared_ptr<FILE> ptr(fp, fclose);

	char buf[1024];
	fread(buf, sizeof(buf), 1, ptr.get());
}


int main(int argc, char**argv)
{
  auto lim = atoi(argv[1]);

  std::vector<int> vec;
  vec.reserve(lim);

  while(--lim)
    vec.push_back(random());

  if(*argv[2]=='q')
    qsort(&vec[0], vec.size(), sizeof(int), cmp);
  else if(*argv[2]=='p')
    __gnu_parallel::sort(vec.begin(), vec.end(), [](const auto& a, const auto& b) { return a < b; });
  else if(*argv[2]=='s')
    std::sort(vec.begin(), vec.end(), [](const auto& a, const auto& b) { return a < b; } );
}