[#BloombergLP-bdlb-TransformIterator_AllocatorOfFunctorMethod-01]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::TransformIterator_AllocatorOfFunctorMethod
:relfileprefix: ../../
:mrdocs:

Base class template that optionally provides an `allocator` method.

== Synopsis

Declared in `<bdlb_transformiterator.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class BASE_TYPE,
    bool>
struct TransformIterator_AllocatorOfFunctorMethod;
----

== Description

The `TransformIterator_AllocatorOfFunctorMethod` class template has an allocator method when its boolean template parameter is `true`, which will be made to be the case when the iterator of the transform iterator does not use allocators and the functor of the transform iterator uses allocators. The transform iterator type itself is supplied as `BASE_TYPE`.

== Specializations

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlb/TransformIterator_AllocatorOfFunctorMethod-0d.adoc[`TransformIterator_AllocatorOfFunctorMethod<BASE_TYPE, true>`] 
| Base providing `allocator` when only the functor uses allocators.
|===


== Derived Classes

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlb/TransformIterator.adoc[`TransformIterator`] 
| Wrapping iterator that invokes a functor on dereference.
|===


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