本文整理汇总了C++中IndexReader::front方法的典型用法代码示例。如果您正苦于以下问题：C++ IndexReader::front方法的具体用法？C++ IndexReader::front怎么用？C++ IndexReader::front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IndexReader的用法示例。
在下文中一共展示了IndexReader::front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: MinimumHeap
int
SmallFileIndex::init_data_source(void *init_para,
RecordReader **reader)
{
int ret = 0;
vector<plfs_pathback> &droppings = *(((index_init_para_t *)init_para)->namefiles);
list<index_mapping_t> *fid = ((index_init_para_t *)init_para)->fids;
MinimumHeap *min_heap = new MinimumHeap(fid->size(), index_compare_func);
mlog(SMF_DAPI, "Start to build index %p.", this);
if (fid->size() == 0) {
*reader = min_heap;
return 0;
}
unsigned int buf_size = get_read_buffer_size(fid->size());
list<index_mapping_t>::const_iterator itr;
for (itr = fid->begin(); itr != fid->end(); itr++ ) {
string index_fname;
IndexReader *indexfile;
int pop_result;
struct plfs_pathback entry;
entry.back = droppings[itr->second].back;
assert(itr->second < droppings.size());
ret = dropping_name2index(droppings[itr->second].bpath, entry.bpath);
if (ret) {
mlog(SMF_ERR, "Unable to get index file name from name file:%s.",
droppings[itr->second].bpath.c_str());
break;
}
indexfile = new IndexReader(entry, *itr, buf_size);
/* Only after this pop_front(), we can get the first record. */
pop_result = indexfile->pop_front();
if (pop_result == 1 && indexfile->front()) {
mlog(SMF_DAPI, "Load index entries from %s.", entry.bpath.c_str());
min_heap->push_back(indexfile);
} else if (pop_result == 0 || pop_result == -ENOENT) {
delete indexfile;
mlog(SMF_DAPI, "Skip empty or non-existent index file:%s.",
entry.bpath.c_str());
} else {
delete indexfile;
mlog(SMF_ERR, "Unable to read index entries from %s, err = %d!",
entry.bpath.c_str(), pop_result);
ret = pop_result;
break;
}
}
if (ret == 0) {
mlog(SMF_DAPI, "Successfully build index %p.", this);
*reader = min_heap;
} else {
delete min_heap;
mlog(SMF_DAPI, "Failed to build index %p. errno = %d.", this, ret);
}
return ret;
}