Namespaces
Variants
Views
Actions

std::ranges::viewable_range

From cppreference.com
< cpp‎ | ranges
 
C++
 
Ranges library
Range adaptors
 
Defined in header <ranges>
template< class T >

concept viewable_range =
    ranges::range<T> &&
    ((ranges::view<std::remove_cvref_t<T>> &&
      std::constructible_from<std::remove_cvref_t<T>, T>) ||
     (!ranges::view<std::remove_cvref_t<T>> &&
      (std::is_lvalue_reference_v<T> ||

       (std::movable<std::remove_reference_t<T>> && !/*is-initializer-list*/<T>))));
 (since C++20)

The viewable_range concept is a refinement of range that describes a range that can be converted into a view through views::all.

The constant /*is-initializer-list*/<T> is true if and only if