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 //////////////////////////////////////////////////////////////////////////////
 //
 // (C) Copyright Ion Gaztanaga 2005-2012. Distributed under the Boost
 // Software License, Version 1.0. (See accompanying file
 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 //
 // See http://www.boost.org/libs/interprocess for documentation.
 //
 //////////////////////////////////////////////////////////////////////////////
 
 #ifndef BOOST_INTERPROCESS_MANAGED_HEAP_MEMORY_HPP
 #define BOOST_INTERPROCESS_MANAGED_HEAP_MEMORY_HPP
 
 #ifndef BOOST_CONFIG_HPP
 #  include <boost/config.hpp>
 #endif
 #
 #if defined(BOOST_HAS_PRAGMA_ONCE)
 #  pragma once
 #endif
 
 #include <boost/interprocess/detail/config_begin.hpp>
 #include <boost/interprocess/detail/workaround.hpp>
 #include <boost/interprocess/creation_tags.hpp>
 #include <boost/move/utility_core.hpp>
 #include <vector>
 #include <boost/interprocess/detail/managed_memory_impl.hpp>
 #include <boost/core/no_exceptions_support.hpp>
 //These includes needed to fulfill default template parameters of
 //predeclarations in interprocess_fwd.hpp
 #include <boost/interprocess/mem_algo/rbtree_best_fit.hpp>
 #include <boost/interprocess/sync/mutex_family.hpp>
 #include <boost/interprocess/indexes/iset_index.hpp>
 
 //!\file
 //!Describes a named heap memory allocation user class.
 
 namespace boost {
 namespace interprocess {
 
 //!A basic heap memory named object creation class. Initializes the
 //!heap memory segment. Inherits all basic functionality from
 //!basic_managed_memory_impl<CharType, AllocationAlgorithm, IndexType>*/
 template
       <
          class CharType,
          class AllocationAlgorithm,
          template<class IndexConfig> class IndexType
       >
 class basic_managed_heap_memory
    : public ipcdetail::basic_managed_memory_impl <CharType, AllocationAlgorithm, IndexType>
 {
    #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
    private:
 
    typedef ipcdetail::basic_managed_memory_impl
       <CharType, AllocationAlgorithm, IndexType>             base_t;
    BOOST_MOVABLE_BUT_NOT_COPYABLE(basic_managed_heap_memory)
    #endif   //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
 
    public: //functions
    typedef typename base_t::size_type              size_type;
 
    //!Default constructor. Does nothing.
    //!Useful in combination with move semantics
    basic_managed_heap_memory() BOOST_NOEXCEPT
    {}
 
    //!Destructor. Liberates the heap memory holding the managed data.
    //!Never throws.
    ~basic_managed_heap_memory()
    {  this->priv_close();  }
 
    //!Creates heap memory and initializes the segment manager.
    //!This can throw.
    basic_managed_heap_memory(size_type size)
       :  m_heapmem(size, char(0))
    {
       if(!base_t::create_impl(&m_heapmem[0], size)){
          this->priv_close();
          throw interprocess_exception("Could not initialize heap in basic_managed_heap_memory constructor");
       }
    }
 
    //!Moves the ownership of "moved"'s managed memory to *this. Does not throw
    basic_managed_heap_memory(BOOST_RV_REF(basic_managed_heap_memory) moved) BOOST_NOEXCEPT
    {  this->swap(moved);   }
 
    //!Moves the ownership of "moved"'s managed memory to *this. Does not throw
    basic_managed_heap_memory &operator=(BOOST_RV_REF(basic_managed_heap_memory) moved) BOOST_NOEXCEPT
    {
       basic_managed_heap_memory tmp(boost::move(moved));
       this->swap(tmp);
       return *this;
    }
 
    //!Tries to resize internal heap memory so that
    //!we have room for more objects.
    //!WARNING: If memory is reallocated, all the objects will
    //!be binary-copied to the new buffer. To be able to use
    //!this function, all pointers constructed in this buffer
    //!must be offset pointers. Otherwise, the result is undefined.
    //!Returns true if the growth has been successful, so you will
    //!have some extra bytes to allocate new objects. If returns
    //!false, the heap allocation has failed.
    bool grow(size_type extra_bytes)
    {
       //If memory is reallocated, data will
       //be automatically copied
       BOOST_TRY{
         m_heapmem.resize(m_heapmem.size()+extra_bytes);
       }
       BOOST_CATCH(...){
          return false;
       }
       BOOST_CATCH_END
 
       //Grow always works
       base_t::close_impl();
       base_t::open_impl(&m_heapmem[0], m_heapmem.size());
       base_t::grow(extra_bytes);
       return true;
    }
 
    //!Swaps the ownership of the managed heap memories managed by *this and other.
    //!Never throws.
    void swap(basic_managed_heap_memory &other) BOOST_NOEXCEPT
    {
       base_t::swap(other);
       m_heapmem.swap(other.m_heapmem);
    }
 
    #if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
    private:
    //!Frees resources. Never throws.
    void priv_close()
    {
       base_t::destroy_impl();
       std::vector<char>().swap(m_heapmem);
    }
 
    std::vector<char>  m_heapmem;
    #endif   //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
 };
 
 #ifdef BOOST_INTERPROCESS_DOXYGEN_INVOKED
 
 //!Typedef for a default basic_managed_heap_memory
 //!of narrow characters
 typedef basic_managed_heap_memory
    <char
    ,rbtree_best_fit<null_mutex_family>
    ,iset_index>
 managed_heap_memory;
 
 //!Typedef for a default basic_managed_heap_memory
 //!of wide characters
 typedef basic_managed_heap_memory
    <wchar_t
    ,rbtree_best_fit<null_mutex_family>
    ,iset_index>
 wmanaged_heap_memory;
 
 #endif   //#ifdef BOOST_INTERPROCESS_DOXYGEN_INVOKED
 
 }  //namespace interprocess {
 }  //namespace boost {
 
 #include <boost/interprocess/detail/config_end.hpp>
 
 #endif   //BOOST_INTERPROCESS_MANAGED_HEAP_MEMORY_HPP
 

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