[#BloombergLP-bslstl-DefaultSearcher-operator_call]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/DefaultSearcher.adoc[DefaultSearcher]::operator()
:relfileprefix: ../../../
:mrdocs:

Search the specified range `[haystackFirst, haystackLast)]` for the first sequence of `value_type` values specified on construction. Return the range where those values are found, or the range `[haystackLast, haystackLast)]` if that sequence is not found. The search is performed using a "naive" algorithm that has time complexity of: ` bsl::distance(needleFirst(), needleLast()) * bsl::distance(haystackFirst, haystackLast); ` Values of the "needle" sequence and the "haystack" sequence are compared using the equality comparison functor specified on construction. The behavior is undefined unless `haystackFirst` can be advanced to equal `haystackLast` and the iterators used to construct this object, `needleFirst()` and `needleLast()`, are still valid. Note that if the "needle" sequence is empty, the range `[haystackFirst, haystackFirst)]` is returned. Also note that if the "needle" sequence is longer than the "haystack" sequence ‐‐ thus, impossible for the "needle" to be found in the "haystack" ‐‐ the range `[haystackLast, haystackLast)]` is returned.

== Synopsis

Declared in `<bslstl_defaultsearcher.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class FORWARD_ITR_HAYSTACK>
xref:bsl/pair-0b.adoc[bsl::pair<FORWARD_ITR_HAYSTACK, FORWARD_ITR_HAYSTACK>]
operator()(
    FORWARD_ITR_HAYSTACK haystackFirst,
    FORWARD_ITR_HAYSTACK haystackLast) const;
----


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