std::ranges::transform_view<V,F>:: iterator

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C++
Ranges library
Range adaptors
std::ranges::transform_view
Member functions
Deduction guides
Iterator
Sentinel
template < bool Const >
class /*iterator*/
(since C++20)
( exposition only* )

The return type of transform_view::begin , and of transform_view::end when the underlying view is a common_range .

The type /*iterator*/ < true > is returned by the const-qualified overloads. The type /*iterator*/ < false > is returned by the non-const-qualified overloads.

Member types

Member type Definition
Parent (private) maybe-const  < Const, ranges:: transform_view < V, F >>
( exposition-only member type* )
Base (private) maybe-const  < Const, V >
( exposition-only member type* )
iterator_concept
iterator_category
(present only if Base models
forward_range ) 		Let MCF be maybe-const  < Const, F > .

Otherwise, let C be std:: iterator_traits < ranges:: iterator_t < Base >> :: iterator_category .

value_type std:: remove_cvref_t < std:: invoke_result_t < MCF & , ranges:: range_reference_t < Base >>> , where MCF denotes maybe-const  < Const, F >
difference_type ranges:: range_difference_t < Base >

Data members

Member name Definition
current_ (private) An iterator into (possibly const-qualified) V .
( exposition-only member object* )
parent_ (private) A pointer to parent transform_view .
( exposition-only member object* )

Member functions

constructs an iterator
(public member function)
returns the underlying iterator
(public member function)
accesses the transformed element
(public member function)
accesses an element by index
(public member function)
advances or decrements the underlying iterator
(public member function)

Non-member functions

(C++20)
compares the underlying iterators
(function)
(C++20)
performs iterator arithmetic
(function)
(C++20)
obtains an rvalue reference to the transformed element
(function)

Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior
P2259R1 C++20 member iterator_category is always defined defined only if Base models forward_range
LWG 3555 C++20 the definition of iterator_concept ignores const made to consider
LWG 3798 C++20 iterator_category is input-only if transformation result is rvalue reference may have a stronger category
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