本文整理汇总了C++中MovieData::find_rating_by_id方法的典型用法代码示例。如果您正苦于以下问题：C++ MovieData::find_rating_by_id方法的具体用法？C++ MovieData::find_rating_by_id怎么用？C++ MovieData::find_rating_by_id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MovieData的用法示例。
在下文中一共展示了MovieData::find_rating_by_id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: append_user_batch
/*
* load and write a batch of users
*/
void IBBL_LargeFile::append_user_batch(int_set::iterator& batch_start,
int_set::iterator& batch_end,
int& offset,
ofstream& user_offset_file,
ofstream& user_file)
{
if (batch_start == batch_end)
return;
int_ur_mmap user_map;
/* go through every movie file */
MovieData d;
movie_rating r;
user_rating u;
int uid;
for (int id = 1; id <= NUM_MOVIES; ++id)
{
// load the movie
d.load_from_binary(this, id);
// go through each user
for (int_set::iterator itr = batch_start; itr != batch_end; ++itr)
{
uid = *itr;
if (d.find_rating_by_id(uid, &r))
{
// convert the rating to a user rating and add to that user's list
u.rating = r.rating;
u.movie_id = id;
u.year = r.year;
u.month = r.month;
u.day = r.day;
user_map.insert(make_pair(uid, u));
}
}
}
/* save each user to the file */
int num_user_ratings;
int_ur_mmap::iterator begin, end;
for (int_set::iterator itr = batch_start; itr != batch_end; ++itr)
{
uid = *itr;
pair<int_ur_mmap::iterator,int_ur_mmap::iterator> ret = user_map.equal_range(uid);
// write the number of ratings
num_user_ratings = user_map.count(uid);
user_file.write((char*)&num_user_ratings, 4);
// write and increment the offset
user_offset_file.write((char*)&uid, 4);
user_offset_file.write((char*)&offset, 4);
offset += 4 + num_user_ratings * sizeof(user_rating);
// write each rating
begin = ret.first;
end = ret.second;
for (int_ur_mmap::iterator u_itr = begin; u_itr != end; ++u_itr)
{
u = u_itr->second;
user_file.write((char*)&u, sizeof(user_rating));
}
}
}