Package _Framework :: Module Util :: Class BooleanContext

Class BooleanContext

object --+
         |
        BooleanContext

This class represents an boolean variable with RAII setting within a scope. It is useful to break recursions in an exception-safe way. The boolean context can be used in nested fashion, as long as you request a new context manager for every 'with' statement using the call operator. Example:

 in_notification = BooleanContext()

 assert not in_notification
 with in_notification():
     assert in_notification
     with in_notification():
         assert in_notification
     assert in_notification
 assert not in_notification

The 'default_value' parameter indicates the initial value. It will be negated when you enter the context.

Nested Classes

[hide private]

Manager

Instance Methods

[hide private]

__init__(self, default_value=None, *a, **k)
x.__init__(...) initializes x; see help(type(x)) for signature

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__nonzero__(self)

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__bool__(self)

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__call__(self)
Makes a context manager for the boolean context

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Inherited from object: __delattr__, __format__, __getattribute__, __hash__, __new__, __reduce__, __reduce_ex__, __repr__, __setattr__, __sizeof__, __str__, __subclasshook__