[#TxGraph-GetBlockBuilder]
= xref:TxGraph.adoc[TxGraph]::GetBlockBuilder
:relfileprefix: ../
:mrdocs:

Construct a block builder, drawing chunks in order, from the main graph, which cannot be oversized&period; While the returned object exists, no mutators on the main graph are allowed&period; The BlockBuilder object must not outlive the TxGraph it was created with&period;

== Synopsis

Declared in `&lt;txgraph&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
virtual
std::unique&lowbar;ptr&lt;BlockBuilder&gt;
GetBlockBuilder() noexcept = 0;
----

== Return Value

A block builder that draws chunks from the main graph in order&period;


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