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Diffstat (limited to 'libcult/cult/mm/counter.hxx')
-rw-r--r-- | libcult/cult/mm/counter.hxx | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/libcult/cult/mm/counter.hxx b/libcult/cult/mm/counter.hxx new file mode 100644 index 0000000..12e1e70 --- /dev/null +++ b/libcult/cult/mm/counter.hxx @@ -0,0 +1,79 @@ +// file : cult/mm/counter.hxx +// author : Boris Kolpackov <boris@kolpackov.net> +// copyright : Copyright (c) 2005-2010 Boris Kolpackov +// license : GNU GPL v2 + exceptions; see accompanying LICENSE file + +#ifndef CULT_MM_COUNTER_HXX +#define CULT_MM_COUNTER_HXX + +#ifdef CULT_THREADS + +// Multi-threaded version is architecture-specific. +// +#include <cult/mm/arch/counter.hxx> + +#else + +// Single-threaded version. +// + +#include <cult/types/fundamental.hxx> + +namespace Cult +{ + namespace MM + { + class Counter: public NonCopyable + { + public: + Counter (); + + // After failure assume the counter has its old value. + // + Void + inc_ref (); + + + // After failure assume the counter has its new value. + // + Boolean + dec_ref (); + + + Size + count () const; + + private: + Size value_; + }; + } +} + +#include <cult/mm/counter.ixx> + +#endif // CULT_THREADS + + +#include <cult/mm/new.hxx> +#include <cult/mm/static-ptr.hxx> + +namespace Cult +{ + namespace MM + { + extern StaticPtr<Key<Counter> > counted; + + + // Non-member inc_ref. Especially useful for messing with `this'. + // + template <typename X> + X* + inc_ref (X* p) + { + locate (p, *counted)->inc_ref (); + return p; + } + } +} + +#endif // CULT_MM_COUNTER_HXX |