本文整理汇总了C++中Counter::begin方法的典型用法代码示例。如果您正苦于以下问题：C++ Counter::begin方法的具体用法？C++ Counter::begin怎么用？C++ Counter::begin使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Counter的用法示例。
在下文中一共展示了Counter::begin方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: main
int main(int argc, char *argv[])
{
int oc;
size_t ntask = sysconf(_SC_NPROCESSORS_ONLN);
size_t nslot = sysconf(_SC_NPROCESSORS_ONLN);
int range = 0x10000;
float s = 0.0;
size_t size = 10000000;
bool check = false;
char * file = NULL;
nslot *= nslot;
while ((oc = getopt(argc, argv, "t:k:n:r:s:w:zh")) != -1) {
switch (oc) {
case 't':
ntask = std::min((size_t)strtoul(optarg, 0, 10), ntask);
break;
case 'k':
nslot = strtoul(optarg, 0, 10);
break;
case 'n':
size = strtoul(optarg, 0, 10);
break;
case 'r':
range = atoi(optarg);
break;
case 's':
s = atof(optarg);
break;
case 'w':
file = optarg;
break;
case 'z':
check = true;
break;
case 'h':
printf(usage, argv[0]);
exit(EXIT_SUCCESS);
default:
exit(EXIT_FAILURE);
}
}
typedef wc_splitter Splitter;
typedef multi_hash_runtime<
wc_splitter, size_t, size_t, wc_mapper, mapcombine::simple_partition<size_t> > Runtime;
typedef Runtime::storage_type Storage;
// for verification
typedef open_hash_map<Storage::key_type, Storage::value_type> Counter;
// three elements of a computation
Splitter splitter(size, range, s);
Storage storage(nslot);
Runtime runtime(splitter, storage);
timespec timer;
timer_start(&timer);
runtime.run(ntask);
float elapsed = timer_stop(&timer);
printf("nslot=%lu, range=%d, s=%f, size=%lu, elapsed=%f\n",
(unsigned long)nslot, range, s, (unsigned long)size, elapsed);
splitter.split(1);
Splitter::chunk_type chunk = splitter.chunk(0);
if (file) {
FILE *fp = fopen(file, "wb");
if (fp == NULL) {
fprintf(stderr, "cannot open %s\n", file);
exit(EXIT_FAILURE);
}
for (Splitter::chunk_type::const_iterator it = chunk.begin();
it != chunk.end(); ++it) {
Splitter::chunk_type::value_type r = *it;
fwrite(&r, sizeof(r), 1, fp);
}
fclose(fp);
}
if (check) {
Counter counter;
timer_start(&timer);
for (Splitter::chunk_type::iterator it = chunk.begin();
it != chunk.end(); ++it)
++counter[*it];
elapsed = timer_stop(&timer);
fprintf(stderr, "build counter successfully: %f sec\n", elapsed);
for (Counter::const_iterator it = counter.begin(); it != counter.end(); ++it) {
if (it.value() != storage[it.key()]) {
fprintf(stderr, "expect %zu, actual %zu for key %zu\n",
storage[it.key()], it.value(), it.key().key());
exit(EXIT_FAILURE);
}
}
fprintf(stderr, "backward check OK\n");
//.........这里部分代码省略.........