C++判断类型的模板

is_void

is_null_pointer

is_integral

is_floating_point

is_array

is_enum

is_union

is_class

is_function

is_pointer

is_lvalue_reference

is_rvalue_reference

is_member_object_pointer

is_member_function_pointer

#include <iostream>
#include <type_traits>
 
struct A {};
 
class B {};
 
enum class C {};
 
int main() 
{
    std::cout << std::boolalpha;
    std::cout << std::is_class<A>::value << std::endl;
    std::cout << std::is_class<B>::value << std::endl;
    std::cout << std::is_class<C>::value << std::endl;
    std::cout << std::is_class<int>::value << std::endl;
}

true
true
false
false

https://zh.cppreference.com/w/cpp/types