[#llvm-DataLayoutCallbackTy-0c]
= xref:llvm.adoc[llvm]::DataLayoutCallbackTy
:relfileprefix: ../
:mrdocs:

Callback that may override the data layout string found in LLVM assembly.

== Synopsis

Declared in `<llvm/AsmParser/Parser.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef xref:llvm/function_ref-03.adoc[llvm::function_ref<std::optional<std::string>(xref:llvm/StringRef.adoc[StringRef], xref:llvm/StringRef.adoc[StringRef])>] DataLayoutCallbackTy;
----

== Description

The first argument is the target triple. The second is the data layout string from the input, or a default. That input layout is used if the callback returns std::nullopt.


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