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Diffstat (limited to 'odb/shared-ptr/base.txx')
-rw-r--r-- | odb/shared-ptr/base.txx | 200 |
1 files changed, 0 insertions, 200 deletions
diff --git a/odb/shared-ptr/base.txx b/odb/shared-ptr/base.txx deleted file mode 100644 index 5cf85f3..0000000 --- a/odb/shared-ptr/base.txx +++ /dev/null @@ -1,200 +0,0 @@ -// file : odb/shared-ptr/base.txx -// author : Boris Kolpackov <boris@codesynthesis.com> -// copyright : Copyright (c) 2009-2010 Code Synthesis Tools CC -// license : GNU GPL v2; see accompanying LICENSE file - -#include <odb/meta/answer.hxx> -#include <odb/meta/polymorphic-p.hxx> - -namespace odb -{ - namespace bits - { - // Support for locating the counter in the memory block. - // - template <typename X, bool poly = meta::polymorphic_p<X>::r> - struct locator; - - template <typename X> - struct locator<X, false> - { - static std::size_t* - counter (X* x) - { - std::size_t* p (reinterpret_cast<std::size_t*> (x)); - - if (*(--p) != 0xDEADBEEF) - throw not_shared (); - - return --p; - } - }; - - template <typename X> - struct locator<X, true> - { - static std::size_t* - counter (X* x) - { - std::size_t* p ( - static_cast<std::size_t*> ( - dynamic_cast<void*> (x))); - - if (*(--p) != 0xDEADBEEF) - throw not_shared (); - - return --p; - } - }; - - template <typename X> - std::size_t* - counter (const X* p) - { - return bits::locator<X>::counter (const_cast<X*> (p)); - } - - // Counter type and operations. - // - meta::no test (...); - meta::yes test (shared_base*); - - template <typename X, - std::size_t A = sizeof (bits::test (reinterpret_cast<X*> (0)))> - struct counter_type; - - template <typename X> - struct counter_type<X, sizeof (meta::no)> - { - typedef X r; - }; - - template <typename X> - struct counter_type<X, sizeof (meta::yes)> - { - typedef shared_base r; - }; - - template <typename X, typename Y> - struct counter_ops; - - template <typename X> - struct counter_ops<X, X> - { - counter_ops (const X* p) : counter_ (p ? bits::counter (p) : 0) {} - counter_ops (const counter_ops& x) : counter_ (x.counter_) {} - - template <typename Z> - counter_ops (const counter_ops<Z, Z>& x) : counter_ (x.counter_) {} - - counter_ops& - operator= (const counter_ops& x) - { - counter_ = x.counter_; - return *this; - } - - template <typename Z> - counter_ops& - operator= (const counter_ops<Z, Z>& x) - { - counter_ = x.counter_; - return *this; - } - - void - reset (const X* p) - { - counter_ = p ? bits::counter (p) : 0; - } - - void - inc (X*) - { - (*counter_)++; - } - - void - dec (X* p) - { - if (--(*counter_) == 0) - { - p->~X (); - operator delete (counter_); // Counter is the top of the memory block. - } - } - - std::size_t - count (const X*) const - { - return *counter_; - } - - std::size_t* counter_; - }; - - template <typename Y> - struct counter_ops<shared_base, Y> - { - counter_ops (const Y*) {} - counter_ops (const counter_ops&) {} - - template <typename Z> - counter_ops (const counter_ops<shared_base, Z>&) {} - - counter_ops& - operator= (const counter_ops&) - { - return *this; - } - - template <typename Z> - counter_ops& - operator= (const counter_ops<shared_base, Z>&) - { - return *this; - } - - void - reset (const Y*) {} - - void - inc (shared_base* p) {p->_inc_ref ();} - - void - dec (Y* p) - { - if (static_cast<shared_base*> (p)->_dec_ref ()) - delete p; - } - - std::size_t - count (const shared_base* p) const {return p->_ref_count ();} - }; - } - - template <typename X> - inline X* - inc_ref (X* p) - { - bits::counter_ops<typename bits::counter_type<X>::r, X> c (p); - c.inc (p); - return p; - } - - template <typename X> - inline void - dec_ref (X* p) - { - bits::counter_ops<typename bits::counter_type<X>::r, X> c (p); - c.dec (p); - } - - template <typename X> - inline std::size_t - ref_count (const X* p) - { - bits::counter_ops<typename bits::counter_type<X>::r, X> c (p); - return c.count (p); - } -} |