#include <boost/detail/lightweight_mutex.hpp>
#include <functional> // for std::less
+#if 0
#include <exception> // for std::exception
+#endif
namespace boost
{
+#if 0
class use_count_is_zero: public std::exception
{
public:
virtual char const * what() const throw()
{
- return "use_count_is_zero";
+ return "use_count_is_zero";
}
};
+#endif
class counted_base
{
public:
counted_base():
- use_count_(0), weak_count_(0), self_deleter_(&self_delete)
+ use_count_(0), weak_count_(0), self_deleter_(&self_delete)
{
}
// pre: initial_use_count <= initial_weak_count
explicit counted_base(long initial_use_count, long initial_weak_count):
- use_count_(initial_use_count), weak_count_(initial_weak_count), self_deleter_(&self_delete)
+ use_count_(initial_use_count), weak_count_(initial_weak_count), self_deleter_(&self_delete)
{
}
void add_ref()
{
#ifdef BOOST_HAS_THREADS
- mutex_type::scoped_lock lock(mtx_);
+ mutex_type::scoped_lock lock(mtx_);
+#endif
+#if 0
+ if(use_count_ == 0 && weak_count_ != 0) throw use_count_is_zero();
+#else
+ if(use_count_ == 0 && weak_count_ != 0) assert(false);
#endif
- if(use_count_ == 0 && weak_count_ != 0) throw use_count_is_zero();
- ++use_count_;
- ++weak_count_;
+ ++use_count_;
+ ++weak_count_;
}
void release() // nothrow
{
- long new_use_count;
- long new_weak_count;
+ long new_use_count;
+ long new_weak_count;
- {
+ {
#ifdef BOOST_HAS_THREADS
- mutex_type::scoped_lock lock(mtx_);
+ mutex_type::scoped_lock lock(mtx_);
#endif
- new_use_count = --use_count_;
- new_weak_count = --weak_count_;
- }
+ new_use_count = --use_count_;
+ new_weak_count = --weak_count_;
+ }
- if(new_use_count == 0)
- {
- dispose();
- }
+ if(new_use_count == 0)
+ {
+ dispose();
+ }
- if(new_weak_count == 0)
- {
- // not a direct 'delete this', because the inlined
- // release() may use a different heap manager
- self_deleter_(this);
- }
+ if(new_weak_count == 0)
+ {
+ // not a direct 'delete this', because the inlined
+ // release() may use a different heap manager
+ self_deleter_(this);
+ }
}
void weak_add_ref() // nothrow
{
#ifdef BOOST_HAS_THREADS
- mutex_type::scoped_lock lock(mtx_);
+ mutex_type::scoped_lock lock(mtx_);
#endif
- ++weak_count_;
+ ++weak_count_;
}
void weak_release() // nothrow
{
- long new_weak_count;
+ long new_weak_count;
- {
+ {
#ifdef BOOST_HAS_THREADS
- mutex_type::scoped_lock lock(mtx_);
+ mutex_type::scoped_lock lock(mtx_);
#endif
- new_weak_count = --weak_count_;
- }
+ new_weak_count = --weak_count_;
+ }
- if(new_weak_count == 0)
- {
- self_deleter_(this);
- }
+ if(new_weak_count == 0)
+ {
+ self_deleter_(this);
+ }
}
long use_count() const // nothrow
{
#ifdef BOOST_HAS_THREADS
- mutex_type::scoped_lock lock(mtx_);
+ mutex_type::scoped_lock lock(mtx_);
#endif
- return use_count_;
+ return use_count_;
}
private:
static void self_delete(counted_base * p)
{
- delete p;
+ delete p;
}
// inv: use_count_ <= weak_count_
// pre: initial_use_count <= initial_weak_count, d(p) must not throw
counted_base_impl(P p, D d, long initial_use_count, long initial_weak_count):
- counted_base(initial_use_count, initial_weak_count), ptr(p), del(d)
+ counted_base(initial_use_count, initial_weak_count), ptr(p), del(d)
{
}
virtual void dispose() // nothrow
{
- del(ptr);
+ del(ptr);
}
};
explicit shared_count(counted_base * pi): pi_(pi) // never throws
{
- pi_->add_ref();
+ pi_->add_ref();
}
template<class P, class D> shared_count(P p, D d, void const * = 0): pi_(0)
{
- try
- {
- pi_ = new counted_base_impl<P, D>(p, d, 1, 1);
- }
- catch(...)
- {
- d(p); // delete p
- throw;
- }
+#if 0
+ try
+ {
+#endif
+ pi_ = new counted_base_impl<P, D>(p, d, 1, 1);
+#if 0
+ }
+ catch(...)
+ {
+ d(p); // delete p
+ throw;
+ }
+#endif
}
template<class P, class D> shared_count(P, D, counted_base * pi): pi_(pi)
{
- pi_->add_ref();
+ pi_->add_ref();
}
#ifndef BOOST_NO_AUTO_PTR
template<typename Y>
explicit shared_count(std::auto_ptr<Y> & r): pi_(new counted_base_impl< Y *, checked_deleter<Y> >(r.get(), checked_deleter<Y>(), 1, 1))
{
- r.release();
+ r.release();
}
-#endif
+#endif
~shared_count() // nothrow
{
- pi_->release();
+ pi_->release();
}
shared_count(shared_count const & r): pi_(r.pi_) // nothrow
{
- pi_->add_ref();
+ pi_->add_ref();
}
explicit shared_count(weak_count const & r); // throws use_count_is_zero when r.use_count() == 0
shared_count & operator= (shared_count const & r) // nothrow
{
- counted_base * tmp = r.pi_;
- tmp->add_ref();
- pi_->release();
- pi_ = tmp;
+ counted_base * tmp = r.pi_;
+ tmp->add_ref();
+ pi_->release();
+ pi_ = tmp;
- return *this;
+ return *this;
}
void swap(shared_count & r) // nothrow
{
- counted_base * tmp = r.pi_;
- r.pi_ = pi_;
- pi_ = tmp;
+ counted_base * tmp = r.pi_;
+ r.pi_ = pi_;
+ pi_ = tmp;
}
long use_count() const // nothrow
{
- return pi_->use_count();
+ return pi_->use_count();
}
bool unique() const // nothrow
{
- return pi_->use_count() == 1;
+ return pi_->use_count() == 1;
}
friend inline bool operator==(shared_count const & a, shared_count const & b)
{
- return a.pi_ == b.pi_;
+ return a.pi_ == b.pi_;
}
friend inline bool operator<(shared_count const & a, shared_count const & b)
{
- return std::less<counted_base *>()(a.pi_, b.pi_);
+ return std::less<counted_base *>()(a.pi_, b.pi_);
}
};
weak_count(shared_count const & r): pi_(r.pi_) // nothrow
{
- pi_->weak_add_ref();
+ pi_->weak_add_ref();
}
weak_count(weak_count const & r): pi_(r.pi_) // nothrow
{
- pi_->weak_add_ref();
+ pi_->weak_add_ref();
}
~weak_count() // nothrow
{
- pi_->weak_release();
+ pi_->weak_release();
}
weak_count & operator= (shared_count const & r) // nothrow
{
- counted_base * tmp = r.pi_;
- tmp->weak_add_ref();
- pi_->weak_release();
- pi_ = tmp;
+ counted_base * tmp = r.pi_;
+ tmp->weak_add_ref();
+ pi_->weak_release();
+ pi_ = tmp;
- return *this;
+ return *this;
}
weak_count & operator= (weak_count const & r) // nothrow
{
- counted_base * tmp = r.pi_;
- tmp->weak_add_ref();
- pi_->weak_release();
- pi_ = tmp;
+ counted_base * tmp = r.pi_;
+ tmp->weak_add_ref();
+ pi_->weak_release();
+ pi_ = tmp;
- return *this;
+ return *this;
}
void swap(weak_count & r) // nothrow
{
- counted_base * tmp = r.pi_;
- r.pi_ = pi_;
- pi_ = tmp;
+ counted_base * tmp = r.pi_;
+ r.pi_ = pi_;
+ pi_ = tmp;
}
long use_count() const // nothrow
{
- return pi_->use_count();
+ return pi_->use_count();
}
friend inline bool operator==(weak_count const & a, weak_count const & b)
{
- return a.pi_ == b.pi_;
+ return a.pi_ == b.pi_;
}
friend inline bool operator<(weak_count const & a, weak_count const & b)
{
- return std::less<counted_base *>()(a.pi_, b.pi_);
+ return std::less<counted_base *>()(a.pi_, b.pi_);
}
};