从string到stringstream到vector <int>

Question

我有一个步骤的示例程序,我想在我的应用程序上实现.我想将字符串上的int元素分别推送到向量中.我怎么能够？

#include <iostream>
#include <sstream>

#include <vector>

using namespace std;

int main(){

    string line = "1 2 3 4 5"; //includes spaces
    stringstream lineStream(line);


    vector<int> numbers; // how do I push_back the numbers (separately) here?
    // in this example I know the size of my string but in my application I won't


    }

Answer 1

这是一个经典的例子std::back_inserter.

copy(istream_iterator<int>(lineStream), istream_iterator<int>(),
     back_inserter(numbers));

如果您愿意,可以从一开始就创建矢量

vector<int> numbers((istream_iterator<int>(lineStream)), 
                    istream_iterator<int>());

记得在第一个参数周围加上括号.编译器认为它是一个函数声明.如果使用向量来获取数字的迭代器,则可以直接使用istream迭代器:

istream_iterator<int> begin(lineStream), end;
while(begin != end) cout << *begin++ << " ";

Answer 2

int num;
while (lineStream >> num) numbers.push_back(num);