Synopsis

Declared in <bdlb_transformiterator.h>

template<
    class RESULT,
    class ARGUMENT,
    class ITERATOR>
struct TransformIterator_Traits<RESULT(ARGUMENT), ITERATOR>
    : TransformIterator_Traits<bsl::function<RESULT(ARGUMENT)>, ITERATOR>

Base Classes

Name

Description

TransformIterator_Traits<bsl::function<RESULT(ARGUMENT)>, ITERATOR>

This component‐private class defines various types that are used in the implementation of the transform iterator.

Type Aliases

Name

Description

BaseIteratorTraits

Define the iterator traits class of the underlying iterator.

ResultType

Define the result type returned by the functor. This is not necessarily the same type as the dereference of the iterator. In C++11, the result type can be determined automatically. Note that various iterations of the language standard might want to instead use std::result_of or std::invoke_result (which have been variously added and then deprecated), but the following works from C++11 onwards.

difference_type

Type used to represent distances between iterators.

iterator_category

Define the iterator category of the transform iterator. If the functor returns a reference type, we pass through the iterator category of the underlying iterator, otherwise we use the input iterator tag (because all the other tags require that dereferencing produces a reference).

pointer

reference

Define the remaining standard types of the transform iterator.

value_type

Value type produced by applying the functor to a dereferenced underlying iterator.

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