C++：返回 C 字符串的最快方法

如何以最快的方法返回 C 字符串

cpp
#include 
const char* getCString() {
    const char* str = "Hello, World!";
    return str;
}
int main() {
    const char* result = getCString();
    std::cout << result << std::endl;
    return 0;
}

cpp
#include 
#include 
std::string getCString() {
    std::string str = "Hello, World!";
    return str;
}
int main() {
    std::string result = getCString();
    std::cout << result.c_str() << std::endl;
    return 0;
}