meta::bidirectional_range¶
Defined in header <mgs/meta/concepts/bidirectional_range.hpp>
.
template <typename T>
concept bidirectional_range =
meta::forward_range<T> && meta::bidirectional_iterator<meta::iterator_t<T>>;
Pre-C++20 implementation of the std::ranges::bidirectional_range concept.
Concept emulation¶
namespace mgs {
namespace meta {
template <typename T>
struct is_bidirectional_range { /* ... */ };
template <typename T>
constexpr auto is_bidirectional_range_v = is_bidirectional_range<T>::value;
template <typename T,
typename = std::enable_if_t<is_bidirectional_range_v<T>>>
using bidirectional_range = T;
} // namespace meta
} // namespace mgs
Example¶
#include <mgs/meta/concepts/bidirectional_range.hpp>
using namespace mgs::meta;
static_assert(is_bidirectional_range_v<std::list<char>>, "");
static_assert(is_bidirectional_range_v<char [2]>, "");
static_assert(!is_bidirectional_range_v<std::forward_list<char>>, "");