代码片段：基于STL实现的读取纯数字文本文件

参考链接：https://bbs.csdn.net/topics/380024058

#include <fstream>
#include <vector>
#include <iterator>
#include <iostream>
using namespace std;
 
int main(void){
    ifstream in("data.txt");
    typedef istream_iterator<double> IsIter;
    vector<double> vec;
    copy( IsIter(in), IsIter(), back_inserter(vec) );
    copy( vec.begin(),vec.end(), ostream_iterator<double>(cout," ") );
}