[#wallet-CalculateMaximumSignedInputSize-0f]
= xref:wallet.adoc[wallet]::CalculateMaximumSignedInputSize
:relfileprefix: ../
:mrdocs:

Get the marginal bytes if spending the specified output, using an explicit signing provider.

== Synopsis

Declared in `<wallet/spend.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
CalculateMaximumSignedInputSize(
    xref:CTxOut.adoc[CTxOut] const& txout,
    xref:COutPoint.adoc[COutPoint] outpoint,
    xref:SigningProvider.adoc[SigningProvider] const* pwallet,
    bool can_grind_r,
    xref:wallet/CCoinControl.adoc[CCoinControl] const* coin_control);
----

== Return Value

The marginal size in bytes of the signed input, or ‐1 on failure.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *txout*
| The output that would be spent.
| *outpoint*
| The outpoint identifying the output being spent.
| *pwallet*
| The signing provider used to estimate the signature size.
| *can_grind_r*
| Whether low‐R signature grinding may be assumed when sizing the input.
| *coin_control*
| Coin control settings that may override signing information.
|===


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