Method: Concurrent::Map#compute_if_present

Defined in:

lib/concurrent-ruby/concurrent/map.rb

#compute_if_present(key) {|old_value| ... } ⇒ Object^?

Note:

Atomic methods taking a block do not allow the self instance to be used within the block. Doing so will cause a deadlock.

Compute and store new value for key if the key is present. This method is atomic.

Parameters:

• key (Object)

Yields:

• new value

Yield Parameters:

• old_value (Object)

Yield Returns:

• (Object, nil) —

  new value, when nil the key is removed

Returns:

• (Object, nil) —

  new value or nil

# File 'lib/concurrent-ruby/concurrent/map.rb', line 55