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authorDaniel Wilhelm <daniel@wili.li>2014-04-18 17:15:16 +0200
committerDaniel Wilhelm <daniel@wili.li>2014-04-18 17:15:16 +0200
commitbd6336c629841c6db3a6ca53a936d629d34db53b (patch)
tree3721ef997864108df175ce677a8a7d4342a6f1d2 /shared/loki/Allocator.h
parent4.0 (diff)
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4.1
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diff --git a/shared/loki/Allocator.h b/shared/loki/Allocator.h
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-////////////////////////////////////////////////////////////////////////////////
-// The Loki Library
-// Copyright (c) 2008 by Rich Sposato
-//
-// Permission to use, copy, modify, distribute and sell this software for any
-// purpose is hereby granted without fee, provided that the above copyright
-// notice appear in all copies and that both that copyright notice and this
-// permission notice appear in supporting documentation.
-// The author makes no representations about the
-// suitability of this software for any purpose. It is provided "as is"
-// without express or implied warranty.
-////////////////////////////////////////////////////////////////////////////////
-
-#ifndef LOKI_ALLOCATOR_HPP_INCLUDED
-#define LOKI_ALLOCATOR_HPP_INCLUDED
-
-// $Id: Allocator.h 896 2008-08-08 22:20:05Z syntheticpp $
-
-// Requires project to be compiled with loki/src/SmallObj.cpp and loki/src/Singleton.cpp
-
-#include <loki/SmallObj.h>
-
-
-namespace Loki
-{
-
-
-//-----------------------------------------------------------------------------
-
-/** @class LokiAllocator
- Adapts Loki's Small-Object Allocator for STL container classes.
- This class provides all the functionality required for STL allocators, but
- uses Loki's Small-Object Allocator to perform actual memory operations.
- Implementation comes from a post in Loki forums (by Rasmus Ekman?).
- */
-template
-<
-typename Type,
- typename AllocT = Loki::AllocatorSingleton<>
- >
-class LokiAllocator
-{
-public:
-
- typedef ::std::size_t size_type;
- typedef ::std::ptrdiff_t difference_type;
- typedef Type* pointer;
- typedef const Type* const_pointer;
- typedef Type& reference;
- typedef const Type& const_reference;
- typedef Type value_type;
-
- /// Default constructor does nothing.
- inline LokiAllocator( void ) throw() { }
-
- /// Copy constructor does nothing.
- inline LokiAllocator( const LokiAllocator& ) throw() { }
-
- /// Type converting allocator constructor does nothing.
- template < typename Type1 >
- inline LokiAllocator( const LokiAllocator< Type1 > & ) throw() { }
-
- /// Destructor does nothing.
- inline ~LokiAllocator() throw() { }
-
- /// Convert an allocator<Type> to an allocator <Type1>.
- template < typename Type1 >
- struct rebind
- {
- typedef LokiAllocator< Type1 > other;
- };
-
- /// Return address of reference to mutable element.
- pointer address( reference elem ) const { return &elem; }
-
- /// Return address of reference to const element.
- const_pointer address( const_reference elem ) const { return &elem; }
-
- /** Allocate an array of count elements. Warning! The true parameter in
- the call to Allocate means this function can throw exceptions. This is
- better than not throwing, and returning a null pointer in case the caller
- assumes the return value is not null.
- @param count # of elements in array.
- @param hint Place where caller thinks allocation should occur.
- @return Pointer to block of memory.
- */
- pointer allocate( size_type count, const void* hint = 0 )
- {
- (void)hint; // Ignore the hint.
- void* p = AllocT::Instance().Allocate( count * sizeof( Type ), true );
- return reinterpret_cast< pointer >( p );
- }
-
- /// Ask allocator to release memory at pointer with size bytes.
- void deallocate( pointer p, size_type size )
- {
- AllocT::Instance().Deallocate( p, size * sizeof( Type ) );
- }
-
- /// Calculate max # of elements allocator can handle.
- size_type max_size( void ) const throw()
- {
- // A good optimizer will see these calculations always produce the same
- // value and optimize this function away completely.
- const size_type max_bytes = size_type( -1 );
- const size_type bytes = max_bytes / sizeof( Type );
- return bytes;
- }
-
- /// Construct an element at the pointer.
- void construct( pointer p, const Type& value )
- {
- // A call to global placement new forces a call to copy constructor.
- ::new( p ) Type( value );
- }
-
- /// Destruct the object at pointer.
- void destroy( pointer p )
- {
- // If the Type has no destructor, then some compilers complain about
- // an unreferenced parameter, so use the void cast trick to prevent
- // spurious warnings.
- (void)p;
- p->~Type();
- }
-
-};
-
-//-----------------------------------------------------------------------------
-
-/** All equality operators return true since LokiAllocator is basically a
- monostate design pattern, so all instances of it are identical.
- */
-template < typename Type >
-inline bool operator == ( const LokiAllocator< Type > &, const LokiAllocator< Type > & )
-{
- return true;
-}
-
-/** All inequality operators return false since LokiAllocator is basically a
- monostate design pattern, so all instances of it are identical.
- */
-template < typename Type >
-inline bool operator != ( const LokiAllocator< Type > & , const LokiAllocator< Type > & )
-{
- return false;
-}
-
-//-----------------------------------------------------------------------------
-
-} // namespace Loki
-
-#endif // LOKI_ALLOCATOR_INCLUDED
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