[#BloombergLP-bdlb-TopologicalSortUtil_Helper-2constructor]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/TopologicalSortUtil_Helper.adoc[TopologicalSortUtil_Helper]::TopologicalSortUtil_Helper
:relfileprefix: ../../../
:mrdocs:

Create a helper class that holds the different data structures required to sort in topological order the directed acyclic graph described by the specified `relationsBegin` and `relationsEnd`. Optionally, specify an `allocator` for needed memory. If `allocator` is 0, use the globally supply default allocator instead.

== Synopsis

Declared in `<bdlb_topologicalsortutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
TopologicalSortUtil_Helper(
    INPUT_ITER relationsBegin,
    INPUT_ITER relationsEnd,
    xref:BloombergLP/bslma/Allocator.adoc[bslma::Allocator]* allocator = 0);
----


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