C++ 从字符串到字符串流再到 vector<int>
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Going from string to stringstream to vector<int>
提问by andandandand
I've this sample program of a step that I want to implement on my application. I want to push_back the int elements on the string separately, into a vector. How can I?
我有一个我想在我的应用程序上实现的步骤的示例程序。我想将字符串上的 int 元素分别推回一个向量中。我怎样才能？
#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
}
回答by Johannes Schaub - litb
This is a classic example of std::back_inserter.
这是一个经典的例子std::back_inserter。
copy(istream_iterator<int>(lineStream), istream_iterator<int>(),
back_inserter(numbers));
You can create the vector right from the start on, if you wish
如果您愿意，您可以从一开始就创建矢量
vector<int> numbers((istream_iterator<int>(lineStream)),
istream_iterator<int>());
Remember to put parentheses around the first argument. The compiler thinks it's a function declaration otherwise. If you use the vector for just getting iterators for the numbers, you can use the istream iterators directly:
请记住在第一个参数周围加上括号。否则编译器认为它是一个函数声明。如果您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++ << " ";
回答by Mehrdad Afshari
int num;
while (lineStream >> num) numbers.push_back(num);
