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

Compute the fee for a given size `at_size` using this object's feerate.

== Synopsis

Declared in `<util/feefrac.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<bool RoundDown>
int64_t
EvaluateFee(int32_t at_size) const noexcept;
----

== Description

This effectively corresponds to evaluating (this‐>fee * at_size) / this‐>size, with the result rounded towards negative infinity (if RoundDown) or towards positive infinity (if !RoundDown).

Requires this‐>size > 0, at_size >= 0, and that the correct result fits in a int64_t. This is guaranteed to be the case when 0 <= at_size <= this‐>size.

== Return Value

The fee corresponding to at_size at this object's feerate.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *at_size*
| The size to evaluate the fee at.
|===


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