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Compound statements?

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If you mean something like:

// something that isn't an if, while, etc.
// other stuff

Then the nested compound statement introduces a new scope. You can use it to make sure a temporary value you need is destroyed as soon as it isn't being used. Ex:

Mutex m("mutex name");
Lock l(m);
// stuff that needs to be done while the mutex is locked
// mutex is unlocked as as the scope is exited

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