Call a function before function exits

Question

I will begin with an example. Suppose I need to guard a code with a function inside a mutex. There are two ways of implementing this.

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Answer 1

You could use something like ScopeGuard. (Now somewhat old-fashioned.)

But given how easy and clear it is to construct a specific RAII wrapper for each resource type I would normally do that.

(I don't think boost ever adopted anything like ScopeGuard. With std::function, lambdas and so on it's easy to do your own.)