std::experimental::reflect:: Object

From cppreference.com
C++
Experimental
Extensions for reflection
Concepts
Meta-object operations
Variable
FunctionParameter
Callable
Variable and Callable
Namespace and Callable
ParenthesizedExpression
FunctionCallExpression
FunctionalConversion
Variable and Function
Defined in header <experimental/reflect>
template < class T >
concept Object = /* see below */ ;
(reflection TS)

The Object concept is satisfied if and only if T is a meta-object type.

Example

Run this code 
#include <experimental/reflect>
 
namespace reflect = std::experimental::reflect;
 
template<reflect::Object M>
struct meta_t {
    template<reflect::Object M1>
    friend constexpr bool operator==(meta_t, meta_t<M1>) noexcept
    {
        return reflect::reflects_same_v<M, M1>;
    }
    template<reflect::Object M1>
    friend constexpr bool operator!=(meta_t, meta_t<M1>) noexcept
    {
        return !reflect::reflects_same_v<M, M1>;
    }
};
 
template<reflect::Object M>
constexpr meta_t<M> meta{};
 
int main()
{
    static_assert(meta<reflexpr(int)> == meta<reflexpr(signed int)>, "");
    // meta<int>; // error: int is not a meta-object type
}
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