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std::ranges::iter_move - cppreference.com

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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 to:

  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 is well-formed and is an lvalue.
  3. Otherwise, *t if *t is well-formed and is an rvalue.

In all other cases, a call to ranges::iter_move is ill-formed, which can result in substitution failure when ranges::iter_move(e) appears in the immediate context of a template instantiation.

If ranges::iter_move(e) is not equal to *e, the program is ill-formed, no diagnostic required.

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. See CustomizationPointObject for details.

Example

See also

casts the result of dereferencing the adjusted underlying iterator to its associated rvalue reference type
(function) [edit]
casts the result of dereferencing the underlying iterator to its associated rvalue reference type
(function) [edit]