From 2718e529181515b273b2214635c09f35e5ba4ad0 Mon Sep 17 00:00:00 2001
From: Emil Dotchevski <emil@revergestudios.com>
Date: Sun, 31 Aug 2008 02:40:42 +0000
Subject: [PATCH] simplified further

[SVN r48485]
---
 include/boost/exception/exception.hpp | 250 +++++++++++++++++++++++++-
 include/boost/throw_exception.hpp     |   3 +-
 2 files changed, 248 insertions(+), 5 deletions(-)

diff --git a/include/boost/exception/exception.hpp b/include/boost/exception/exception.hpp
index 645d237..3e7cf27 100644
--- a/include/boost/exception/exception.hpp
+++ b/include/boost/exception/exception.hpp
@@ -6,12 +6,114 @@
 #ifndef UUID_274DA366004E11DCB1DDFE2E56D89593
 #define UUID_274DA366004E11DCB1DDFE2E56D89593
 
-#include <boost/exception/detail/counted_base.hpp>
-#include <boost/exception/detail/refcount_ptr.hpp>
-
 namespace
 boost
     {
+
+    ////////////////////////////////////////////////////////////////////////
+
+    namespace
+    exception_detail
+        {
+        template <class T>
+        class
+        refcount_ptr
+            {
+            public:
+
+            refcount_ptr():
+                px_(0)
+                {
+                }
+
+            ~refcount_ptr()
+                {
+                release();
+                }
+
+            refcount_ptr( refcount_ptr const & x ):
+                px_(x.px_)
+                {
+                add_ref();
+                }
+
+            refcount_ptr &
+            operator=( refcount_ptr const & x )
+                {
+                adopt(x.px_);
+                return *this;
+                }
+
+            void
+            adopt( T * px )
+                {
+                release();
+                px_=px;
+                add_ref();
+                }
+
+            T *
+            get() const
+                {
+                return px_;
+                }
+
+            private:
+
+            T * px_;
+
+            void
+            add_ref()
+                {
+                if( px_ )
+                    intrusive_ptr_add_ref(px_);
+                }
+
+            void
+            release()
+                {
+                if( px_ )
+                    intrusive_ptr_release(px_);
+                }
+            };
+        }
+
+    ////////////////////////////////////////////////////////////////////////
+
+    namespace
+    exception_detail
+        {
+        class
+        counted_base
+            {
+            friend
+            void
+            intrusive_ptr_add_ref( counted_base const * c )
+                {
+                c->add_ref();
+                }
+
+            friend
+            void
+            intrusive_ptr_release( counted_base const * c )
+                {
+                c->release();
+                }
+
+            virtual void add_ref() const=0;
+            virtual void release() const=0;
+
+            protected:
+
+            virtual
+            ~counted_base() throw()
+                {
+                }
+            };
+        }
+
+    ////////////////////////////////////////////////////////////////////////
+
     class exception;
 
     template <class>
@@ -88,6 +190,148 @@ boost
     ~exception() throw()
         {
         }
+
+    ////////////////////////////////////////////////////////////////////////
+
+    namespace
+    exception_detail
+        {
+        template <class T>
+        struct
+        error_info_injector:
+            public T,
+            public exception
+            {
+            explicit
+            error_info_injector( T const & x ):
+                T(x)
+                {
+                }
+
+            ~error_info_injector() throw()
+                {
+                }
+            };
+
+        struct large_size { char c[256]; };
+        large_size dispatch( exception * );
+
+        struct small_size { };
+        small_size dispatch( void * );
+
+        template <class,int>
+        struct enable_error_info_helper;
+
+        template <class T>
+        struct
+        enable_error_info_helper<T,sizeof(large_size)>
+            {
+            typedef T type;
+            };
+
+        template <class T>
+        struct
+        enable_error_info_helper<T,sizeof(small_size)>
+            {
+            typedef error_info_injector<T> type;
+            };
+
+        template <class T>
+        struct
+        enable_error_info_return_type
+            {
+            typedef typename enable_error_info_helper<T,sizeof(dispatch((T*)0))>::type type;
+            };
+        }
+
+    template <class T>
+    inline
+    typename
+    exception_detail::enable_error_info_return_type<T>::type
+    enable_error_info( T const & x )
+        {
+        return typename exception_detail::enable_error_info_return_type<T>::type(x);
+        }
+
+    ////////////////////////////////////////////////////////////////////////
+
+    namespace
+    exception_detail
+        {
+        class
+        clone_base
+            {
+            public:
+
+            virtual clone_base const * clone() const = 0;
+            virtual void rethrow() const = 0;
+            virtual ~clone_base() throw() = 0;
+            };
+
+        inline
+        clone_base::
+        ~clone_base() throw()
+            {
+            }
+
+        inline
+        void
+        copy_boost_exception( exception * a, exception const * b )
+            {
+            *a = *b;
+            }
+
+        inline
+        void
+        copy_boost_exception( void *, void const * )
+            {
+            }
+
+        template <class T>
+        class
+        clone_impl:
+            public T,
+            public clone_base
+            {
+            public:
+
+            explicit
+            clone_impl( T const & x ):
+                T(x)
+                {
+                copy_boost_exception(this,&x);
+                }
+
+            ~clone_impl() throw()
+                {
+                }
+
+            private:
+
+            clone_base const *
+            clone() const
+                {
+                return new clone_impl(*this);
+                }
+
+            void
+            rethrow() const
+                {
+                throw *this;
+                }
+            };
+        }
+
+    template <class T>
+    inline
+    exception_detail::clone_impl<T>
+    enable_current_exception( T const & x )
+        {
+        return exception_detail::clone_impl<T>(x);
+        }
+
+    ////////////////////////////////////////////////////////////////////////
+
     }
 
 #endif
diff --git a/include/boost/throw_exception.hpp b/include/boost/throw_exception.hpp
index ae5ea5a..0834e9d 100644
--- a/include/boost/throw_exception.hpp
+++ b/include/boost/throw_exception.hpp
@@ -37,8 +37,7 @@
 #endif
 
 #if !defined( BOOST_NO_EXCEPTIONS ) && !defined( BOOST_EXCEPTION_DISABLE )
-# include <boost/exception/enable_current_exception.hpp>
-# include <boost/exception/enable_error_info.hpp>
+# include <boost/exception/exception.hpp>
 #endif
 
 namespace boost