[#BloombergLP-bdlb-TransformIterator_Traits-05]
= 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 pointer.

== 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 or function pointer 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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