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

Helper function for 32*64 signed multiplication, returning an unspecified but totally ordered type. This is a fallback version, separate so it can be tested on platforms where it isn't actually needed.

== Synopsis

Declared in `<util/feefrac.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
static
std::pair<int64_t, uint32_t>
MulFallback(
    int64_t a,
    int32_t b) noexcept;
----

== Return Value

The product as a totally ordered (high, low) pair.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *a*
| The 64‐bit signed factor.
| *b*
| The 32‐bit signed factor.
|===


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