meta::signed_integral

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

template <typename T>
concept signed_integral = meta::integral<T> && std::is_signed<T>::value;

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

---

Concept emulation

namespace mgs {
namespace meta {

template <typename T>
struct is_signed_integral { /* ... */ };

template <typename T>
constexpr auto is_signed_integral_v = is_signed_integral<T>::value;

template <typename T,
          typename = std::enable_if_t<is_signed_integral_v<T>>>
using signed_integral = T;

} // namespace meta
} // namespace mgs

Example

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

using namespace mgs::meta;

static_assert(is_signed_integral_v<int>, "");
static_assert(!is_signed_integral_v<unsigned int>, "");