[英]Split Vector into Vector of Vectors
目前,我正在處理Yelp的結果文本文件,其中包含餐館和其他一些信息。 飯店的每個元素都由豎線(|)分隔,而飯店的每個元素都由新線(\\ n)分隔。 (請參見下面的示例)。 我正在嘗試將這條線分成多個向量。 較大的向量將保留所有較小的向量,而較小的向量將各自保留餐館之一的信息。 我如何最好地解決這個問題?
這是文件中的幾行:
Meka's Lounge|42.74|-73.69|407 River Street+Troy, NY 12180|http ://www.yelp.com/biz/mekas-lounge-troy|Bars|5|2|4|4|3|4|5
Tosca Grille|42.73|-73.69|200 Broadway+Troy, NY 12180|http ://www.yelp.com/biz/tosca-grille-troy|American (New)|1|3|2|4
Happy Lunch|42.75|-73.68|827 River St+Troy, NY 12180|http ://www.yelp.com/biz/happy-lunch-troy|American (Traditional)|5|2
Hoosick Street Discount Beverage Center|42.74|-73.67|2200 19th St+Troy, NY 12180|http ://www.yelp.com/biz/hoosick-street-discount-beverage-center-troy|Beer, Wine & Spirits|4|5|5|5|5|4
嘗試這樣的事情:
std::vector< std::vector<std::string> > vecRestaurants;
std::ifstream in("restaurants.txt");
std::string line;
while (std::getline(in, line))
{
std::vector<std::string> info;
std::istringstream iss(line);
while (std::getline(iss, line, '|'))
info.push_back(line);
vecRestaurants.push_back(info);
}
in.close();
// use vecRestaurants as needed...
話雖如此,假設每個餐廳的字段的含義和順序始終相同,則可以選擇定義一個struct
來保存各個字段,然后創建一個struct
值vector
,例如:
struct sRestaurantInfo
{
std::string name;
float field2; // ie 42.74, what is this?
float field3; // ie -73.69, what is this?
std::string address;
std::string url;
std::string type;
// what are the remaining numbers?
};
std::vector<sRestaurantInfo> vecRestaurants;
std::ifstream in("restaurants.txt");
std::string line;
while (std::getline(in, line))
{
sRestaurantInfo info;
std::istringstream iss(line);
std::getline(iss, info.name, '|');
std::getline(iss, line, '|'); std::istringstream(line) >> info.field2;
std::getline(iss, line, '|'); std::istringstream(line) >> info.field3;
std::getline(iss, info.address, '|');
std::getline(iss, info.url, '|');
std::getline(iss, info.type, '|');
// read the remaining numbers if needed...
vecRestaurants.push_back(info);
}
in.close();
// use vecRestaurants as needed...
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