meta::output_range¶

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

template <typename R, typename T>
concept output_range =
  meta::range<R> && meta::output_iterator<meta::iterator_t<R>, T>;

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

Concept emulation¶

namespace mgs {
namespace meta {

template <typename R, typename T>
struct is_output_range { /* ... */ };

template <typename R, typename T>
constexpr auto is_output_range_v = is_output_range<R, T>::value;

template <typename R,
          typename T,
          typename = std::enable_if_t<is_output_range_v<R, T>>>
using output_range = R;

} // namespace meta
} // namespace mgs

Example¶

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

using namespace mgs::meta;

struct input_range {
  char const* begin();
  char const* end();
};

static_assert(is_output_range_v<std::string, char>, "");
static_assert(is_output_range_v<char [2], char>, "");
static_assert(!is_output_range_v<input_range, char>, "");

See also¶