Chris@16: // Boost.Range library
Chris@16: //
Chris@16: //  Copyright Neil Groves 2010. Use, modification and
Chris@16: //  distribution is subject to the Boost Software License, Version
Chris@16: //  1.0. (See accompanying file LICENSE_1_0.txt or copy at
Chris@16: //  http://www.boost.org/LICENSE_1_0.txt)
Chris@16: //
Chris@16: // For more information, see http://www.boost.org/libs/range/
Chris@16: //
Chris@16: #ifndef BOOST_RANGE_DETAIL_ANY_ITERATOR_BUFFER_HPP_INCLUDED
Chris@16: #define BOOST_RANGE_DETAIL_ANY_ITERATOR_BUFFER_HPP_INCLUDED
Chris@16: 
Chris@16: #include <boost/array.hpp>
Chris@16: #include <boost/assert.hpp>
Chris@16: #include <boost/static_assert.hpp>
Chris@16: #include <boost/noncopyable.hpp>
Chris@16: 
Chris@16: namespace boost
Chris@16: {
Chris@16:     template<std::size_t StackBufferSize>
Chris@16:     class any_iterator_buffer
Chris@16:         : noncopyable
Chris@16:     {
Chris@16:         BOOST_STATIC_ASSERT(( StackBufferSize > 0 ));
Chris@16:     public:
Chris@16:         any_iterator_buffer()
Chris@16:             : m_ptr()
Chris@16:         {
Chris@16:         }
Chris@16: 
Chris@16:         ~any_iterator_buffer()
Chris@16:         {
Chris@16:             delete [] m_ptr;
Chris@16:         }
Chris@16: 
Chris@16:         void* allocate(std::size_t bytes)
Chris@16:         {
Chris@16:             BOOST_ASSERT( !m_ptr );
Chris@16:             if (bytes <= StackBufferSize)
Chris@16:                 return m_buffer.data();
Chris@16: 
Chris@16:             m_ptr = new char[bytes];
Chris@16:             return m_ptr;
Chris@16:         }
Chris@16: 
Chris@16:         void deallocate()
Chris@16:         {
Chris@16:             delete [] m_ptr;
Chris@16:             m_ptr = 0;
Chris@16:         }
Chris@16: 
Chris@16:     private:
Chris@16:         // Rationale:
Chris@16:         // Do not use inheritance from noncopyable because this causes
Chris@16:         // the concepts to erroneous detect the derived any_iterator
Chris@16:         // as noncopyable.
Chris@16:         any_iterator_buffer(const any_iterator_buffer&);
Chris@16:         void operator=(const any_iterator_buffer&);
Chris@16: 
Chris@16:         char* m_ptr;
Chris@16:         boost::array<char, StackBufferSize> m_buffer;
Chris@16:     };
Chris@16: 
Chris@16:     class any_iterator_heap_only_buffer
Chris@16:         : noncopyable
Chris@16:     {
Chris@16:     public:
Chris@16:         any_iterator_heap_only_buffer()
Chris@16:             : m_ptr()
Chris@16:         {
Chris@16:         }
Chris@16: 
Chris@16:         ~any_iterator_heap_only_buffer()
Chris@16:         {
Chris@16:             delete [] m_ptr;
Chris@16:         }
Chris@16: 
Chris@16:         void* allocate(std::size_t bytes)
Chris@16:         {
Chris@16:             BOOST_ASSERT( !m_ptr );
Chris@16:             m_ptr = new char[bytes];
Chris@16:             return m_ptr;
Chris@16:         }
Chris@16: 
Chris@16:         void deallocate()
Chris@16:         {
Chris@16:             delete [] m_ptr;
Chris@16:             m_ptr = 0;
Chris@16:         }
Chris@16: 
Chris@16:     private:
Chris@16:         char* m_ptr;
Chris@16:     };
Chris@16: 
Chris@16:     template<std::size_t StackBufferSize>
Chris@16:     class any_iterator_stack_only_buffer
Chris@16:     {
Chris@16:         BOOST_STATIC_ASSERT(( StackBufferSize > 0 ));
Chris@16:     public:
Chris@16:         void* allocate(std::size_t bytes)
Chris@16:         {
Chris@16:             BOOST_ASSERT( bytes <= m_buffer.size() );
Chris@16:             return m_buffer.data();
Chris@16:         }
Chris@16: 
Chris@16:         void deallocate()
Chris@16:         {
Chris@16:         }
Chris@16: 
Chris@16:     private:
Chris@16:         boost::array<char, StackBufferSize> m_buffer;
Chris@16:     };
Chris@16: 
Chris@16:     typedef any_iterator_buffer<64> any_iterator_default_buffer;
Chris@16: } // namespace boost
Chris@16: 
Chris@16: #endif // include guard