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enable_current_exception.hpp decoupled from atomic_count.hpp

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[SVN r48439]
This commit is contained in:
Emil Dotchevski
2008-08-29 04:56:02 +00:00
parent d7b98ba390
commit 0c9d70964e
5 changed files with 535 additions and 239 deletions
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340
doc/source/boost-exception.reno
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9
include/boost/exception/detail/cloning_base.hpp
View File

@ -16,12 +16,19 @@ boost
{
class clone_base;
struct
new_clone
{
clone_base const * c_;
void (*d_)(clone_base const *);
};
class
cloning_base
{
public:
virtual clone_base const * clone() const = 0;
virtual new_clone clone() const = 0;
protected:

108
include/boost/exception/enable_current_exception.hpp
View File

@ -8,7 +8,6 @@
#include <boost/exception/exception.hpp>
#include <boost/exception/detail/cloning_base.hpp>
#include <boost/detail/atomic_count.hpp>
#include <boost/assert.hpp>
#include <new>
@ -31,39 +30,8 @@ boost
{
}
class
clone_base:
public counted_base
{
public:
virtual void rethrow() const=0;
};
struct
bad_alloc_impl:
public clone_base,
public std::bad_alloc
{
void
add_ref() const
{
}
void
release() const
{
}
void
rethrow() const
{
throw *this;
}
};
template <class T>
clone_base * make_clone( T const & );
new_clone make_clone( T const & );
template <class T>
class
@ -80,15 +48,46 @@ boost
copy_boost_exception(this,&x);
}
~clone_impl() throw()
{
}
private:
clone_base const *
new_clone
clone() const
{
return make_clone<T>(*this);
}
};
class
clone_base
{
public:
virtual void rethrow() const=0;
virtual ~clone_base() throw()=0;
};
inline
clone_base::
~clone_base() throw()
{
}
struct
bad_alloc_impl:
public clone_base,
public std::bad_alloc
{
void
rethrow() const
{
throw *this;
}
};
template <class T>
class
exception_clone:
@ -99,27 +98,15 @@ boost
explicit
exception_clone( T const & x ):
T(x),
count_(0)
T(x)
{
copy_boost_exception(this,&x);
}
private:
mutable detail::atomic_count count_;
void
add_ref() const
~exception_clone() throw()
{
++count_;
}
void
release() const
{
if( !--count_ )
delete this;
}
void
@ -129,27 +116,44 @@ boost
}
};
inline
void
delete_clone( clone_base const * c )
{
BOOST_ASSERT(c!=0);
delete c;
}
inline
void
delete_clone_noop( clone_base const * )
{
}
template <class T>
inline
clone_base *
new_clone
make_clone( T const & x )
{
new_clone tmp = {0,0};
try
{
return new exception_clone<T>(x);
tmp.c_=new exception_clone<T>(x);
tmp.d_=&delete_clone;
}
catch(
std::bad_alloc & )
{
static bad_alloc_impl bad_alloc;
return &bad_alloc;
tmp.c_=&bad_alloc;
tmp.d_=&delete_clone_noop;
}
catch(
... )
{
BOOST_ASSERT(0);
return 0;
}
return tmp;
}
}

93
include/boost/exception_ptr.hpp
View File

@ -8,13 +8,76 @@
#include <boost/exception/enable_current_exception.hpp>
#include <boost/exception/detail/get_boost_exception.hpp>
#include <boost/exception/detail/cloning_base.hpp>
#include <boost/detail/atomic_count.hpp>
#include <stdexcept>
#include <new>
namespace
boost
{
namespace
exception_detail
{
class
counted_clone:
public counted_base
{
public:
counted_clone():
count_(0),
clone_(0)
{
}
void
set( new_clone const & nc )
{
clone_ = nc.c_;
clone_deleter_ = nc.d_;
BOOST_ASSERT(clone_!=0);
BOOST_ASSERT(clone_deleter_!=0);
}
void
rethrow() const
{
BOOST_ASSERT(clone_!=0);
clone_->rethrow();
}
private:
counted_clone( counted_clone const & );
counted_clone & operator=( counted_clone const & );
mutable detail::atomic_count count_;
clone_base const * clone_;
void (*clone_deleter_)(clone_base const *);
~counted_clone() throw()
{
if( clone_ )
clone_deleter_(clone_);
}
void
add_ref() const
{
++count_;
}
void
release() const
{
if( !--count_ )
delete this;
}
};
}
typedef intrusive_ptr<exception_detail::counted_clone const> exception_ptr;
class
unknown_exception:
public exception,
@ -37,8 +100,6 @@ boost
}
};
typedef intrusive_ptr<exception_detail::clone_base const> exception_ptr;
namespace
exception_detail
{
@ -72,17 +133,21 @@ boost
exception_ptr
current_exception_std_exception( T const & e1 )
{
intrusive_ptr<exception_detail::counted_clone> x(new exception_detail::counted_clone);
if( boost::exception const * e2 = get_boost_exception(&e1) )
return exception_ptr(exception_detail::make_clone(current_exception_std_exception_wrapper<T>(e1,*e2)));
x->set(exception_detail::make_clone(current_exception_std_exception_wrapper<T>(e1,*e2)));
else
return exception_ptr(exception_detail::make_clone(current_exception_std_exception_wrapper<T>(e1)));
x->set(exception_detail::make_clone(current_exception_std_exception_wrapper<T>(e1)));
return x;
}
inline
exception_ptr
current_exception_unknown_exception()
{
return exception_ptr(exception_detail::make_clone(unknown_exception()));
intrusive_ptr<exception_detail::counted_clone> x(new exception_detail::counted_clone);
x->set(exception_detail::make_clone(unknown_exception()));
return x;
}
inline
@ -90,7 +155,11 @@ boost
current_exception_unknown_std_exception( std::exception const & e )
{
if( boost::exception const * be = get_boost_exception(&e) )
return exception_ptr(exception_detail::make_clone(unknown_exception(*be)));
{
intrusive_ptr<exception_detail::counted_clone> x(new exception_detail::counted_clone);
x->set(exception_detail::make_clone(unknown_exception(*be)));
return x;
}
else
return current_exception_unknown_exception();
}
@ -99,7 +168,9 @@ boost
exception_ptr
current_exception_unknown_boost_exception( boost::exception const & e )
{
return exception_ptr(exception_detail::make_clone(unknown_exception(e)));
intrusive_ptr<exception_detail::counted_clone> x(new exception_detail::counted_clone);
x->set(exception_detail::make_clone(unknown_exception(e)));
return x;
}
}
@ -114,9 +185,9 @@ boost
catch(
exception_detail::cloning_base & e )
{
exception_detail::clone_base const * c = e.clone();
BOOST_ASSERT(c!=0);
return exception_ptr(c);
intrusive_ptr<exception_detail::counted_clone> x(new exception_detail::counted_clone);
x->set(e.clone());
return x;
}
catch(
std::invalid_argument & e )

224
test/cloning_test.cpp
View File

@ -4,20 +4,63 @@
//file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#include <boost/exception_ptr.hpp>
#include <boost/exception/get_error_info.hpp>
#include <boost/exception/info.hpp>
#include <boost/detail/lightweight_test.hpp>
#include <string>
typedef boost::error_info<struct my_tag,int> my_info;
struct
test_exception:
derives_nothing
{
int & count;
explicit
derives_nothing( int & count ):
count(count)
{
++count;
}
derives_nothing( derives_nothing const & x ):
count(x.count)
{
++count;
}
~derives_nothing()
{
--count;
}
};
struct
derives_std_exception:
std::exception
{
};
int
main()
struct
derives_std_boost_exception:
std::exception,
boost::exception
{
};
struct
derives_boost_exception:
boost::exception
{
};
template <class T>
void
test_std_exception()
{
try
{
throw boost::enable_current_exception(test_exception());
throw T();
}
catch(
... )
@ -29,7 +72,7 @@ main()
BOOST_TEST(false);
}
catch(
test_exception & )
T & )
{
}
catch(
@ -38,5 +81,176 @@ main()
BOOST_TEST(false);
}
}
}
template <class T>
void
test_std_exception_what()
{
try
{
throw T("what");
}
catch(
... )
{
boost::exception_ptr p = boost::current_exception();
try
{
rethrow_exception(p);
BOOST_TEST(false);
}
catch(
T & x )
{
BOOST_TEST(std::string("what")==x.what());
}
catch(
... )
{
BOOST_TEST(false);
}
}
}
int
main()
{
int count=0;
try
{
throw boost::enable_current_exception(derives_nothing(count));
}
catch(
... )
{
boost::exception_ptr p = boost::current_exception();
try
{
rethrow_exception(p);
BOOST_TEST(false);
}
catch(
derives_nothing & )
{
}
catch(
... )
{
BOOST_TEST(false);
}
}
BOOST_TEST(count==0);
try
{
throw boost::enable_current_exception(derives_std_exception());
}
catch(
... )
{
boost::exception_ptr p = boost::current_exception();
try
{
rethrow_exception(p);
BOOST_TEST(false);
}
catch(
derives_std_exception & )
{
}
catch(
... )
{
BOOST_TEST(false);
}
}
try
{
throw derives_std_exception();
}
catch(
... )
{
boost::exception_ptr p = boost::current_exception();
try
{
rethrow_exception(p);
BOOST_TEST(false);
}
catch(
boost::unknown_exception & )
{
}
catch(
... )
{
BOOST_TEST(false);
}
}
test_std_exception_what<std::invalid_argument>();
test_std_exception_what<std::out_of_range>();
test_std_exception_what<std::logic_error>();
test_std_exception<std::bad_alloc>();
test_std_exception<std::bad_cast>();
test_std_exception<std::bad_typeid>();
test_std_exception<std::bad_exception>();
try
{
throw derives_std_boost_exception() << my_info(42);
}
catch(
... )
{
boost::exception_ptr p = boost::current_exception();
try
{
rethrow_exception(p);
BOOST_TEST(false);
}
catch(
boost::unknown_exception & x )
{
BOOST_TEST(boost::get_error_info<my_info>(x));
if( boost::shared_ptr<int const> p=boost::get_error_info<my_info>(x) )
BOOST_TEST(*p==42);
}
catch(
... )
{
BOOST_TEST(false);
}
}
try
{
throw derives_boost_exception() << my_info(42);
}
catch(
... )
{
boost::exception_ptr p = boost::current_exception();
try
{
rethrow_exception(p);
BOOST_TEST(false);
}
catch(
boost::unknown_exception & x )
{
BOOST_TEST(boost::get_error_info<my_info>(x));
if( boost::shared_ptr<int const> p=boost::get_error_info<my_info>(x) )
BOOST_TEST(*p==42);
}
catch(
... )
{
BOOST_TEST(false);
}
}
return boost::report_errors();
}