meta::movable¶

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

template <typename T>
concept movable =
  std::is_object_v<T> &&
  meta::move_constructible<T> &&
  meta::assignable_from<T&, T> &&
  meta::swappable<T>;

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

Concept emulation¶

namespace mgs {
namespace meta {

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

template <typename T>
constexpr auto is_movable_v = is_movable<T>::value;

template <typename T,
          typename = std::enable_if_t<is_movable_v<T>>>
using movable = T;

} // namespace meta
} // namespace mgs

Example¶

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

using namespace mgs::meta;

static_assert(is_movable_v<int>, "");
static_assert(is_movable_v<std::string>, "");
static_assert(!is_movable_v<int&>, "");

See also¶