问如何在C++中以编程方式检查字符串类型

EN

#include <iostream>
#include <string>
#include <type_traits>

template<typename B>
B check(B b)
{
    if constexpr (std::is_same_v<B, std::string>) {
        std::cout << "std::string" << std::endl;
        return b;
    } else if constexpr (std::is_same_v<B, const char*>) {
        std::cout << "const char *" << std::endl;
        return b;
    } else {
        throw; // obviously you might want do to something different
    }
}

int main() {
    check("ciao");
    check(std::string{"ciao"});
    check(1); // throws
}

template<typename B>
B check(B b)
{
    static_assert(std::is_convertible_v<const char *, B>); // just an idea
    if constexpr (std::is_same_v<B, std::string>) {
        std::cout << "std::string" << std::endl;
        return b;
    }
    else if constexpr (std::is_same_v<B, const char*>) {
        std::cout << "const char *" << std::endl;
        return b;
    } else {
        std::cout << "other type convertible from `const char *`" << std::endl;
    }

}

int main() {
    check("ciao");
    check(std::string{"ciao"});
    //check(1); // fails at compile time
}