[#llvm-ValueMapConfig]
= xref:llvm.adoc[llvm]::ValueMapConfig
:relfileprefix: ../
:mrdocs:

Default configuration for configurable aspects of ValueMap.

== Synopsis

Declared in `<llvm/IR/ValueMap.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    typename KeyT,
    typename MutexT = xref:llvm/sys/Mutex.adoc[sys::Mutex]>
struct ValueMapConfig;
----

== Description

User Configs should inherit from this class to be as compatible as possible with future versions of ValueMap.

== Types

[cols="1,4"]
|===
| Name| Description
| xref:llvm/ValueMapConfig/ExtraData.adoc[`ExtraData`] 
| Extra per‐map state passed to Config callbacks; empty by default.
|===


== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:llvm/ValueMapConfig/mutex_type.adoc[`mutex_type`] 
| Mutex type used when Config requests locking around CallbackVH updates.
|===


== Enums

[cols="1,4"]
|===
| Name| Description
| xref:llvm/ValueMapConfig/_04enum.adoc[`Unnamed enum`] 
| Compile‐time flags that control how ValueMap reacts to key changes.
|===


== Static Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:llvm/ValueMapConfig/getMutex.adoc[`getMutex`] 
| Return a mutex to acquire around CallbackVH‐driven map changes, or null.
| xref:llvm/ValueMapConfig/onDelete.adoc[`onDelete`] 
| Called when a key is deleted; default implementation does nothing.
| xref:llvm/ValueMapConfig/onRAUW.adoc[`onRAUW`] 
| Called when a key is RAUWd; default implementation does nothing.
|===



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