DD::Image::Guard Class Reference

Inherits DD::Image::BaseLockGuard.

List of all members.

Public Member Functions
	Guard (Lock &m)
	Guard (Lock *m)
	~Guard ()

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Detailed Description

This wrapper class locks a lock in it's constructor, and unlocks it upon destruction. This is convienent if your function has many exit points or you are using exceptions, creating a Guard as a local variable will cause the compiler to insert the unlock call everywhere it is needed.

    int proc() {
      static Lock thelock;
      Guard guard(thelock);
      access_protected_data();
      if (dont_need_to_do_it()) return;
      access_protected_data();
      do_stuff_that_may_throw_exceptions();
      access_protected_data();
      // lock is always unlocked even if this statement is not reached:
      return whatever;
    }

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Constructor & Destructor Documentation

DD::Image::Guard::Guard

(

Lock &

m

)

[inline]

The constructor calls m.lock()

DD::Image::Guard::Guard

(

Lock *

m

)

[inline]

You can also construct it with a pointer to a lock.

DD::Image::Guard::~Guard

(

)

[inline]

Calls unlock() on the lock passed to the constructor.