std::experimental::reflect::Object

< cpp‎ | experimental‎ | reflect

在标头 `<experimental/reflect>` 定义
template< class T > concept bool Object = /* see below */;		(反射 TS)

Object 概念当且仅当 T 为元对象类型才得到满足。

示例

#include<experimental/reflect>
 
namespace reflect = std::experimental::reflect;
 
template<reflect::Object M>
struct meta_t {
    template<reflect::Object M1>
    friend constexpr operator==(meta_t, meta_t<M1>) noexcept
    {
        return reflect::reflects_same_v<M, M1>;
    }
    template<reflect::Object M1>
    friend constexpr 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>; // 错误： int 不是元对象类型
}