c++用模板重写<<方法

#include <iostream>
#include <string>
#include <vector>

template<typename T>
std::ostream& operator<<(std::ostream& os, const std::vector<T>& vec)
{
for (auto& el : vec)
{
os << el << ' ';
}
return os;
}

int main()
{
std::vector<std::string> words = {
"Hello", "from", "GCC", __VERSION__, "!"
};
std::cout << words << std::endl;
}