[#BloombergLP-bdlb-TransformIterator_Traits-04]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/TransformIterator_Traits-0f.adoc[TransformIterator_Traits]<RESULT(ARGUMENT), ITERATOR>
:relfileprefix: ../../
:mrdocs:

Traits for a transform iterator whose functor is a function type.

== Synopsis

Declared in `<bdlb_transformiterator.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class RESULT,
    class ARGUMENT,
    class ITERATOR>
struct xref:BloombergLP/bdlb/TransformIterator_Traits-0f.adoc[TransformIterator_Traits]<RESULT(ARGUMENT), ITERATOR>
    : xref:BloombergLP/bdlb/TransformIterator_Traits-0f.adoc[TransformIterator_Traits<bsl::function<RESULT(ARGUMENT)>, ITERATOR>]
----

== Description

Specialize the transform iterator traits template for functors that are function types. It is sufficient to inherit from the version of the traits class that corresponds to a `bsl::function` of the function type parameter.

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:BloombergLP/bdlb/TransformIterator_Traits-0f.adoc[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

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlb/TransformIterator_Traits-0f/BaseIteratorTraits.adoc[`BaseIteratorTraits`] 
| Define the iterator traits class of the underlying iterator.
| xref:BloombergLP/bdlb/TransformIterator_Traits-0f/ResultType.adoc[`ResultType`] 
| Result type of applying the functor to a dereferenced iterator.
| xref:BloombergLP/bdlb/TransformIterator_Traits-0f/difference_type.adoc[`difference_type`] 
| Type used to represent distances between iterators.
| xref:BloombergLP/bdlb/TransformIterator_Traits-0f/iterator_category.adoc[`iterator_category`] 
| Iterator category of this transform iterator.
| xref:BloombergLP/bdlb/TransformIterator_Traits-0f/pointer.adoc[`pointer`] 
| Pointer type derived from the functor result type.
| xref:BloombergLP/bdlb/TransformIterator_Traits-0f/reference.adoc[`reference`] 
| Reference type returned by dereferencing this iterator.
| xref:BloombergLP/bdlb/TransformIterator_Traits-0f/value_type.adoc[`value_type`] 
| Value type produced by applying the functor to a dereferenced underlying iterator.
|===



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