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128 lines
2.5 KiB
C++
128 lines
2.5 KiB
C++
#ifndef nsCppSharedAllocator_h__
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#define nsCppSharedAllocator_h__
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#include "nsIAllocator.h" // for |nsAllocator|
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#include "nscore.h" // for |NS_XXX_CAST|
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#include <new.h> // to allow placement |new|
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// under Metrowerks (Mac), we don't have autoconf yet
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#ifdef __MWERKS__
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#define HAVE_CPP_MEMBER_TEMPLATES
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#define HAVE_CPP_NUMERIC_LIMITS
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#endif
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// under MSVC shut off copious warnings about unused in-lines
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#ifdef _MSC_VER
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#pragma warning( disable: 4514 )
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#endif
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#ifdef HAVE_CPP_NUMERIC_LIMITS
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#include <limits>
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#else
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#include <limits.h>
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#endif
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template <class T>
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class nsCppSharedAllocator
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/*
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...allows Standard Library containers, et al, to use our global shared
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(XP)COM-aware allocator.
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*/
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{
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public:
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typedef T value_type;
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typedef size_t size_type;
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typedef ptrdiff_t difference_type;
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typedef T* pointer;
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typedef const T* const_pointer;
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typedef T& reference;
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typedef const T& const_reference;
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nsCppSharedAllocator() { }
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#ifdef HAVE_CPP_MEMBER_TEMPLATES
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template <class U>
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nsCppSharedAllocator( const nsCppSharedAllocator<U>& ) { }
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#endif
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~nsCppSharedAllocator() { }
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pointer
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address( reference r ) const
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{
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return &r;
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}
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const_pointer
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address( const_reference r ) const
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{
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return &r;
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}
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pointer
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allocate( size_type n, const void* /*hint*/=0 )
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{
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return NS_REINTERPRET_CAST(pointer, nsAllocator::Alloc(NS_STATIC_CAST(PRUint32, n*sizeof(T))));
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}
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void
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deallocate( pointer p, size_type /*n*/ )
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{
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nsAllocator::Free(p);
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}
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void
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construct( pointer p, const T& val )
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{
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new (p) T(val);
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}
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void
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destroy( pointer p )
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{
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p->~T();
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}
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size_type
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max_size() const
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{
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#ifdef HAVE_CPP_NUMERIC_LIMITS
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return numeric_limits<size_type>::max() / sizeof(T);
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#else
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return ULONG_MAX / sizeof(T);
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#endif
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}
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#ifdef HAVE_CPP_MEMBER_TEMPLATES
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template <class U>
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struct rebind
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{
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typedef nsCppSharedAllocator<U> other;
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};
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#endif
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};
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template <class T>
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PRBool
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operator==( const nsCppSharedAllocator<T>&, const nsCppSharedAllocator<T>& )
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{
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return PR_TRUE;
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}
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template <class T>
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PRBool
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operator!=( const nsCppSharedAllocator<T>&, const nsCppSharedAllocator<T>& )
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{
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return PR_FALSE;
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}
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#endif /* !defined(nsCppSharedAllocator_h__) */
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