[#MutableTransactionSignatureCreator-2constructor-08]
= xref:MutableTransactionSignatureCreator.adoc[MutableTransactionSignatureCreator]::MutableTransactionSignatureCreator
:relfileprefix: ../
:mrdocs:

Construct a signature creator reusing precomputed transaction data.

== Synopsis

Declared in `<script/sign.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
MutableTransactionSignatureCreator(
    xref:CMutableTransaction.adoc[CMutableTransaction] const& tx,
    unsigned int input_idx,
    xref:CAmount.adoc[CAmount] const& amount,
    xref:PrecomputedTransactionData.adoc[PrecomputedTransactionData] const* txdata,
    xref:SignOptions.adoc[SignOptions] const& options);
----

== Parameters

[cols="1,4"]
|===
| Name| Description
| *tx*
| The transaction whose input is being signed.
| *input_idx*
| The index of the input to sign.
| *amount*
| The value of the output being spent.
| *txdata*
| Precomputed transaction data shared across inputs.
| *options*
| Options controlling how the input is signed.
|===


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