meta::same_as

Defined in header <mgs/meta/concepts/same_as.hpp>.

template <typename T, typename U>
concept same_as = /* see below */;

Pre-C++20 implementation of the std::same_as concept.

---

Concept emulation

namespace mgs {
namespace meta {

template <typename T, typename U>
struct is_same_as { /* ... */ };

template <typename T, typename U>
constexpr auto is_same_as_v = is_same_as<T, U>::value;

template <typename T, typename U,
          typename = std::enable_if_t<is_same_as_v<T, U>>>
using same_as = T;

} // namespace meta
} // namespace mgs

Example

#include <mgs/meta/concepts/same_as.hpp>

using namespace mgs::meta;

static_assert(is_same_as_v<bool, bool>, "");
static_assert(is_same_as_v<bool, void>, "");