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base: add Weak_object::weak_ptr const

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Issue #1649
This commit is contained in:
Norman Feske 2015-08-18 15:29:38 +02:00 committed by Christian Helmuth
parent 3f3b3a100e
commit b4e3e99cc8
1 changed files with 16 additions and 0 deletions
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16
repos/base/include/base/weak_ptr.h
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@ -290,6 +290,22 @@ struct Genode::Weak_object : Genode::Weak_object_base
* Obtain a weak pointer referring to the weak object
*/
Weak_ptr<T> weak_ptr() { return _weak_ptr<T>(); }
/**
* Const version of 'weak_ptr'
*
* This function is useful in cases where the returned weak pointer is
* merely used for comparison operations.
*/
Weak_ptr<T const> const weak_ptr_const() const
{
/*
* We strip off the constness of 'this' to reuse the internal non-const
* code of the weak object. The executed operations are known to not
* alter the state of the weak object.
*/
return const_cast<Weak_object *>(this)->_weak_ptr<T const>();
}
};