[#BloombergLP-bslmt-OnceGuard-enter]
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Call `enter` on the associated `Once` object and return the result. If `Once::enter` returns `true`, set this object into the "in‐progress" state. The behavior is undefined unless this object has been associated with a `Once` object, either in the constructor or using `setOnce`, or if this object is already in the "in‐progress" state.

== Synopsis

Declared in `<bslmt_once.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
enter();
----


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