Re: code pattern for locking & unlocking

Hi!
I often have to acquire locks and release them after I'm finished with
them.
I use constructor/destructor to acquire & release locks. everything
works fine.
sometime I must acquire a lock for few instructions, then release it
in the middle of a big function. I use braces to get timely
destructors, but I find the "middle of nowhere" braces kind of
embarrassing.
something like:
struct Lock
{
Lock(Mutex& mtx) mtx_(mtx) { mtx.lock(); }
~Lock() { mtx_.unlock(); }
operator bool() { return true;}
};
void someFunc()
{
 // do some stuff
 ...
 // now time to update share data
 {
    Lock myLock(data_mutex);
    //use locked data
    ....
 } // destructor called