[#operator_3way-056]
= operator<=>
:mrdocs:

Comparison between two deques, implementing lexicographic ordering on the contents.

== Synopsis

Declared in `<util/vecdeque.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::strong_ordering
operator<=>(
    xref:VecDeque.adoc[VecDeque] const& a,
    xref:VecDeque.adoc[VecDeque] const& b);
----

[NOTE]
====
This function is a https://en.cppreference.com/w/cpp/language/friend[hidden friend] of xref:VecDeque.adoc[VecDeque], declared only inside that class: it can be found only through argument-dependent lookup.
====

== Return Value

The ordering of a relative to b, comparing elements in order then size.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| The first deque to compare.
| *b*
| The second deque to compare.
|===


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