[#BloombergLP-bslalg-RangeCompare-equal-0b]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslalg.adoc[bslalg]::xref:BloombergLP/bslalg/RangeCompare.adoc[RangeCompare]::equal
:relfileprefix: ../../../
:mrdocs:

Compare each element in the range beginning at the specified `start1` position and ending immediately before the specified `end1` position, to the corresponding element in the range beginning at the specified `start2` position and ending immediately before the specified `end2` position, as if by using `operator==` element‐by‐element. Optionally specify the length of each range, `length1` and `length2`. Return `true` if the ranges have the same length and every element in the first range compares equal with the corresponding element in the second, and `false` otherwise. The behavior is undefined unless `length1` is either unspecified or equals the length of the range `[start1, end1)]`, and `length2` is either unspecified or equals the length of the range `[start2, end2)]`. Note that this implementation uses `operator==` to perform the comparisons, or bit‐wise comparison if the value type has the bit‐wise equality‐comparable trait. Also note that providing lengths may reduce the runtime cost of this operation.

== Synopsis

Declared in `<bslalg_rangecompare.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class INPUT_ITER>
static
bool
equal(
    INPUT_ITER start1,
    INPUT_ITER end1,
    INPUT_ITER start2,
    INPUT_ITER end2);
----


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