std::ranges::iter_move

Defined in header <iterator>
inline namespace /* unspecified */ { inline constexpr /* unspecified */ iter_move = /* unspecified */; }		(since C++20) (customization point object)
Call signature
template < class T > requires /* see below */ constexpr decltype( auto ) iter_move( T&& t ) noexcept ( /* see below */ ) ;		(since C++20)

Obtains an rvalue reference or a prvalue temporary from a given iterator.

A ranges::iter_move(t) is expression-equivalent

1. iter_move(t), if t has a class or enumeration type and the expression is well-formed when treated as an unevaluated operand, where the overload resolution of iter_move is performed only with the candidates found by argument-dependent lookup
2. Otherwise, std::move(*t) if *t
3. Otherwise, *t if *t

In all other cases, a call to ranges::iter_move is ill-formed, which can result in substitution failure when ranges::iter_move(e)

If ranges::iter_move(e) is not equal to *e

Customization point objects

The name ranges::iter_move denotes a customization point object, which is a const function object of a literal semiregular class type. For exposition purposes, the cv-unqualified version of its type is denoted as __iter_move_fn

All instances of __iter_move_fn are equal. The effects of invoking different instances of type __iter_move_fn on the same arguments are equivalent, regardless of whether the expression denoting the instance is an lvalue or rvalue, and is const-qualified or not (however, a volatile-qualified instance is not required to be invocable). Thus, ranges::iter_move

Given a set of types Args..., if std::declval <Args> ( ) meet the requirements for arguments to ranges::iter_move above, __iter_move_fn models

• std::invocable<__iter_move_fn, Args...>
• std::invocable < const __iter_move_fn, Args...>
• std::invocable <__iter_move_fn&, Args...>
• std::invocable < const __iter_move_fn&, Args...> .
  

Otherwise, no function call operator of __iter_move_fn participates in overload resolution.

Example

This section is incomplete Reason: no example

See also

iter_move (C++20)	casts the result of dereferencing the adjusted underlying iterator to its associated rvalue reference type (function)
iter_move (C++20)	casts the result of dereferencing the underlying iterator to its associated rvalue reference type (function)