C++：向量到字符串流
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C++: vector to stringstream
提问by Alerty
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?
我想知道是否可以使用泛型编程将 std::vector 转换为 std::stringstream 以及如何完成这样的事情？
回答by Jacob
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).
改编 Brian Neal 的评论，以下内容仅<<在为std::vector(在本例中为 ) 中的对象定义了运算符时才有效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;
回答by éric Malenfant
If the vector's element type supports operator<<, something like the following may be an option:
如果向量的元素类型支持 operator<<，则类似以下内容可能是一个选项：
std::vector<Foo> v = ...;
std::ostringstream s;
std::copy(v.begin(), v.end(), std::ostream_iterator<Foo>(s));
