Guard class for using Once safely.
Declared in <bslmt_once.h>
class OnceGuard;Construct an object of this class before conditionally entering one-time processing code. Destroy the object when the one-time code is complete. When used this way, this object will be in an "in-progress" state during the time that the one-time code is being executed.
| Name | Description |
|---|---|
OnceGuard [constructor] | Create a guard optionally associated with the specified once object. |
~OnceGuard [destructor] | Destroy this object, completing in-progress once work if needed. |
cancel | If this object is in the "in-progress" state, call cancel on the associated Once object and exit the "in-progress" state. Otherwise, do nothing. |
enter | Enter the associated Once object's one-time region if allowed. |
isInProgress | Return true if this object is in the "in-progress" state. |
leave | If this object is in the "in-progress" state, call leave on the associated Once object and exit the "in-progress" state. Otherwise, do nothing. |
setOnce | Set this object to guard the specified once object. The behavior is undefined if this object is currently in the "in-progress" state. |