[#operator_lt-073]
= operator<
:mrdocs:

Orders outpoints by transaction hash, then output index.

== Synopsis

Declared in `<primitives/transaction.h>`

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

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

== Return Value

True if a orders before b.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| The left‐hand outpoint.
| *b*
| The right‐hand outpoint.
|===


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