std::stringstream:寻求建议

#include<iostream>
#include <vector>
#include <string>
#include <sstream>
#include <algorithm>

using std::cout;
using std::endl;
using std::vector;
using std::string;
using std::stringstream;
using std::for_each;

int main (void){

   string s1 = "5";
   string s2 = "1 4 -1 6 0";
   vector<int> v;
   int val = 0;

   stringstream ss(s1);
   ss >> val;
   cout << "val: " << val << endl;

   ss.str(s2);
   while(val > 0){
      ss >> val;
      cout << "val: " << val << endl;
      v.push_back(val);
   }
   for_each(v.begin(), v.end(), [](int& i){cout << i << endl;});

   return 0;
}

编译代码时:

g++-ggdb-std=c++14-Wall <filename.cpp>

s1 被提取并输入到 val

在第二种情况下,试图从 s2 并输入到 瓦尔 不起作用。 s1 因此循环无限运行。回路的测试条件,即:。, val > 0 ,其依据如下:

参考: std::basic_istream::operator>>

短暂性脑缺血发作