Defined in header <iterator> | ||
|---|---|---|
template< class In >
concept __IndirectlyReadableImpl = // exposition only
requires(const In in) {
typename std::iter_value_t<In>;
typename std::iter_reference_t<In>;
typename std::iter_rvalue_reference_t<In>;
{ *in } -> std::same_as<std::iter_reference_t<In>>;
{ ranges::iter_move(in) } -> std::same_as<std::iter_rvalue_reference_t<In>>;
} &&
std::common_reference_with<
std::iter_reference_t<In>&&, std::iter_value_t<In>&
> &&
std::common_reference_with<
std::iter_reference_t<In>&&, std::iter_rvalue_reference_t<In>&&
> &&
std::common_reference_with<
std::iter_rvalue_reference_t<In>&&, const std::iter_value_t<In>&
>;
| (since C++20) | |
template< class In >
concept indirectly_readable =
__IndirectlyReadableImpl<std::remove_cvref_t<In>>;
| (since C++20) |
The concept indirectly_readable is modeled by types that are readable by applying operator*, such as pointers, smart pointers, and input iterators.
Given a value i of type I, I models indirectly_readable only if all concepts it subsumes are modeled and the expression *i is equality-preserving.
Expressions declared in requires-expressions of the standard library concepts are required to be equality-preserving (except where stated otherwise).
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