[#BloombergLP-bslmt-ReadLockGuard-2constructor-080]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslmt.adoc[bslmt]::xref:BloombergLP/bslmt/ReadLockGuard.adoc[ReadLockGuard]::ReadLockGuard
:relfileprefix: ../../../
:mrdocs:

Create a scoped guard that conditionally manages the specified `lock` (if non‐null) and invokes `lock‐>lockRead()` if the specified `alreadyLockedFlag` is `false`. Supplying a null `lock` has no effect. The behavior is undefined unless the state of `lock` (if non‐null) is consistent with `alreadyLockedFlag`. Note that `alreadyLockedFlag` is used to indicate whether `lock` is in an already‐locked state when passed, so if `alreadyLockedFlag` is `true` the `lock` method will _not_ be called on the supplied `lock`. Also note that `lock` must remain valid throughout the lifetime of this guard, or until `release` is called.

== Synopsis

Declared in `<bslmt_readlockguard.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
ReadLockGuard(
    T* lock,
    bool alreadyLockedFlag);
----


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