diff options
author | Julian Andres Klode <jak@debian.org> | 2010-05-04 17:05:23 +0200 |
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committer | Julian Andres Klode <jak@debian.org> | 2010-05-04 17:05:23 +0200 |
commit | 229fb1a3a35bade26cfff373087461d7a98aade3 (patch) | |
tree | e8c492f9c456243b5291c73030e83dd9e65897d3 /apt-pkg/contrib/weakptr.h | |
parent | af8a8da9c1aa6506d230a0df8abc670661176ba3 (diff) | |
download | apt-229fb1a3a35bade26cfff373087461d7a98aade3.tar.gz |
* apt-pkg/contrib/weakptr.h:
- add a class WeakPointable which allows one to register weak pointers to
an object which will be set to NULL when the object is deallocated.
* [ABI break] apt-pkg/acquire{-worker,-item,}.h:
- subclass pkgAcquire::{Worker,Item,ItemDesc} from WeakPointable.
Diffstat (limited to 'apt-pkg/contrib/weakptr.h')
-rw-r--r-- | apt-pkg/contrib/weakptr.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/apt-pkg/contrib/weakptr.h b/apt-pkg/contrib/weakptr.h new file mode 100644 index 00000000..5158e393 --- /dev/null +++ b/apt-pkg/contrib/weakptr.h @@ -0,0 +1,62 @@ +/* weakptr.h - An object which supports weak pointers. + * + * Copyright (C) 2010 Julian Andres Klode <jak@debian.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, + * MA 02110-1301, USA. + */ + +#ifndef WEAK_POINTER_H +#define WEAK_POINTER_H + +#include <set> +/** + * Class for objects providing support for weak pointers. + * + * This class allows for the registration of certain pointers as weak, + * which will cause them to be set to NULL when the destructor of the + * object is called. + */ +class WeakPointable { +private: + std::set<WeakPointable**> pointers; + +public: + + /** + * Add a new weak pointer. + */ + inline void AddWeakPointer(WeakPointable** weakptr) { + pointers.insert(weakptr); + } + + /** + * Remove the weak pointer from the list of weak pointers. + */ + inline void RemoveWeakPointer(WeakPointable **weakptr) { + pointers.erase(weakptr); + } + + /** + * Deconstruct the object, set all weak pointers to NULL. + */ + ~WeakPointable() { + std::set<WeakPointable**>::iterator iter = pointers.begin(); + while (iter != pointers.end()) + **(iter++) = NULL; + } +}; + +#endif // WEAK_POINTER_H |