Namespaces
Variants
Views
Actions

std::indirectly_copyable_storable

From cppreference.com
< cpp‎ | iterator
 
 
Iterator library
Iterator concepts
Iterator primitives
Algorithm concepts and utilities
Indirect callable concepts
Common algorithm requirements
indirectly_copyable_storable
(C++20)    
(C++20)
(C++20)
(C++20)
Utilities
(C++20)

Iterator adaptors
Iterator customization points
Iterator operations
(C++11)    
(C++11)
Range access
(C++11)(C++14)
(C++14)(C++14)    
(C++11)(C++14)
(C++14)(C++14)    
(C++17)(C++20)
(C++17)
(C++17)
 
Defined in header <iterator>
template< class In, class Out >

concept indirectly_copyable_storable =
    std::indirectly_copyable<In, Out> &&
    std::indirectly_writable<Out, std::iter_value_t<In>&> &&
    std::indirectly_writable<Out, const std::iter_value_t<In>&> &&
    std::indirectly_writable<Out, std::iter_value_t<In>&&> &&
    std::indirectly_writable<Out, const std::iter_value_t<In>&&> &&
    std::copyable<std::iter_value_t<In>> &&
    std::constructible_from<std::iter_value_t<In>, std::iter_reference_t<In>> &&

    std::assignable_from<std::iter_value_t<In>&, std::iter_reference_t<In>>;
(since C++20)

The indirectly_copyable_storable concept specifies the relationship between an indirectly_readable type and an indirectly_writable type. In addition to indirectly_copyable, this concept specifies that the copy from the indirectly_readable type can be performed via an intermediate object.

[edit] Semantic requirements

In and Out model std::indirectly_copyable_storable<In, Out> only if given a dereferenceable value i of type In:

  • After the definition std::iter_value_t<In> obj(*i);, obj is equal to the value previously denoted by *i, and
  • if std::iter_reference_t<In> is an rvalue reference type, *i is placed in a valid but unspecified state after the initialization of obj.

[edit] Equality preservation

Expressions declared in requires expressions of the standard library concepts are required to be equality-preserving (except where stated otherwise).

[edit] See also

specifies that values may be copied from an indirectly_readable type to an indirectly_writable type
(concept) [edit]
specifies that values may be moved from an indirectly_readable type to an indirectly_writable type and that the move may be performed via an intermediate object
(concept) [edit]