print-var-type-cpp17.cpp

#include <iostream>

template<class T>
constexpr
std::string_view
type_name() {
    using namespace std;
    string_view p = __PRETTY_FUNCTION__;
    return string_view(p.data() + 34, p.size() - 34 - 1);
}

// --

int main() {

    char c = 'a';
    std::cout << type_name<decltype(c)>() << std::endl;

    return 0;
}