meta::input_or_output_iterator¶

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

template <typename I>
concept input_or_output_iterator = meta::dereferenceable<I> && meta::weakly_incrementable<I>;

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

Concept emulation¶

namespace mgs {
namespace meta {

template <typename I>
struct is_input_or_output_iterator { /* ... */ };

template <typename I>
constexpr auto is_input_or_output_iterator_v =
                  is_input_or_output_iterator<I>::value;

template <typename I,
          typename = std::enable_if_t<is_input_or_output_iterator_v<I>>>
using input_or_output_iterator = I;

} // namespace meta
} // namespace mgs

Example¶

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

using namespace mgs::meta;

static_assert(is_input_or_output_iterator_v<std::istreambuf_iterator<char>>, "");
static_assert(is_input_or_output_iterator_v<std::back_insert_iterator<std::string>>, "");
static_assert(is_input_or_output_iterator_v<char*>, "");

See also¶