C ++:向量到字符串流 [英] C++: vector to stringstream

问题描述

我想知道是否可以使用通用编程将std :: vector转换为std :: stringstream，以及如何实现这一目标?

I want to know if it is possible to transform a std::vector to a std::stringstream using generic programming and how can one accomplish such a thing?

推荐答案

适应Brian Neal的评论，只有在<< 运算符为中的对象定义了以下内容时，以下内容才有效> std :: vector (在此示例中为 std :: string ).

Adapting Brian Neal's comment, the following will only work if the << operator is defined for the object in the std::vector (in this example, std::string).

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

 // Dummy std::vector of strings
 std::vector<std::string> sentence;
 sentence.push_back("aa");
 sentence.push_back("ab");

 // Required std::stringstream object
 std::stringstream ss;

 // Populate
 std::copy(sentence.begin(), sentence.end(),std::ostream_iterator<std::string>(ss,"\n"));

 // Display
 std::cout<<ss.str()<<std::endl;

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