[#BSLMT_ONCE_CANCEL]
= BSLMT_ONCE_CANCEL
:mrdocs:

This macro provides a way to cancel once processing within a `BSLMT_ONCE_DO` construct. It will not compile outside of a `BSLMT_ONCE_DO` construct. Executing this function‐like macro will set the state of the `BSLMT_ONCE_DO` construct to "not entered", possibly unblocking a thread waiting to enter the one‐time code region. Note that this macro does not exit the `BSLMT_ONCE_DO` construct (i.e., it does not have `break` or `return` semantics).

== Synopsis

Declared in `<bslmt_once.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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#define BSLMT_ONCE_CANCEL()

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