Use std::lock to protect return statement?

Question

As I understood, std::lock locks section under its scope. But what if access to variable is performed in return statement? Example:

// Looks safe...
bool foo
{
    std::lock_guard<decltype(myMutex)> tLock(myMutex);
    if (bar == 123)
    {
        return true;
    }
    else
    {
        return false;
    }
}

// Is it safe?
bool foo
{
    std::lock_guard<decltype(myMutex)> tLock(myMutex);
    return bar == 123;
}

Answer 1

Destructor is called after the return,

so you are fine in both cases.