#include <iostream>
#include <string_view>
template<typename T>
struct TypeName {
constexpr static std::string_view fullname_intern() {
#if defined(__clang__) || defined(__GNUC__)
return __PRETTY_FUNCTION__;
#elif defined(_MSC_VER)
return __FUNCSIG__;
#else
#error "Unsupported compiler"
#endif
}
constexpr static std::string_view name() {
size_t prefix_len = TypeName<void>::fullname_intern().find("void");
size_t multiple = TypeName<void>::fullname_intern().size() - TypeName<int>::fullname_intern().size();
size_t dummy_len = TypeName<void>::fullname_intern().size() - 4*multiple;
size_t target_len = (fullname_intern().size() - dummy_len)/multiple;
std::string_view rv = fullname_intern().substr(prefix_len, target_len);
if (rv.rfind(' ') == rv.npos)
return rv;
return rv.substr(rv.rfind(' ')+1);
}
using type = T;
constexpr static std::string_view value = name();
};
namespace s1 {
class MyClass;
}
int main()
{
static_assert(TypeName<s1::MyClass>::value == "s1::MyClass");
std::cout<<"FULLNAME void> "<<TypeName<void>::fullname_intern()<<std::endl;
std::cout<<"FULLNAME int> "<<TypeName<int>::fullname_intern()<<std::endl;
std::cout<<"TYPETEST> '"<<TypeName<s1::MyClass>::value<<"' == 's1::MyClass'"<<std::endl;
return 0;
}
标签:__,gcc,TypeName,constexpr,rv,7.3,intern,fullname,size
From: https://www.cnblogs.com/nocanstillbb/p/16924882.html