［C++］vector对<<重载

template 
std::ostream& operator << (std::ostream& out, std::vector vec) {
    out << "[";
    for (typename std::vector::iterator ite(vec.begin()); ite != vec.end(); ite++) {
        out << *ite;
        if (vec.end() != ite + 1)
            out << ", ";
    }
    out << "]";
    return out;
}

用法

std::vector v = {1,2,3};
std::cout << v << std::endl;
std::vector> vec = {{1,2,3},{4,5,6}};
std::cout << vec << std::endl;

打印map

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