[#FeeFrac-MulFallback]
= xref:FeeFrac.adoc[FeeFrac]::MulFallback
:relfileprefix: ../
:mrdocs:

Helper function for 32&ast;64 signed multiplication, returning an unspecified but totally ordered type&period; This is a fallback version, separate so it can be tested on platforms where it isn&apos;t actually needed&period;

== Synopsis

Declared in `&lt;util&sol;feefrac&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
std::pair&lt;int64&lowbar;t, uint32&lowbar;t&gt;
MulFallback(
    int64&lowbar;t a,
    int32&lowbar;t b) noexcept;
----

== Return Value

The product as a totally ordered (high, low) pair&period;

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| The 64&hyphen;bit signed factor&period;
| *b*
| The 32&hyphen;bit signed factor&period;
|===


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