gecko/xpcom/ds/nsCppSharedAllocator.h
2011-10-17 10:59:28 -04:00

101 lines
1.9 KiB
C++

#ifndef nsCppSharedAllocator_h__
#define nsCppSharedAllocator_h__
#include "nsMemory.h" // for |nsMemory|
#include NEW_H // to allow placement |new|
// under MSVC shut off copious warnings about unused in-lines
#ifdef _MSC_VER
#pragma warning( disable: 4514 )
#endif
#include <limits.h>
template <class T>
class nsCppSharedAllocator
/*
...allows Standard Library containers, et al, to use our global shared
(XP)COM-aware allocator.
*/
{
public:
typedef T value_type;
typedef size_t size_type;
typedef ptrdiff_t difference_type;
typedef T* pointer;
typedef const T* const_pointer;
typedef T& reference;
typedef const T& const_reference;
nsCppSharedAllocator() { }
~nsCppSharedAllocator() { }
pointer
address( reference r ) const
{
return &r;
}
const_pointer
address( const_reference r ) const
{
return &r;
}
pointer
allocate( size_type n, const void* /*hint*/=0 )
{
return reinterpret_cast<pointer>(nsMemory::Alloc(static_cast<PRUint32>(n*sizeof(T))));
}
void
deallocate( pointer p, size_type /*n*/ )
{
nsMemory::Free(p);
}
void
construct( pointer p, const T& val )
{
new (p) T(val);
}
void
destroy( pointer p )
{
p->~T();
}
size_type
max_size() const
{
return ULONG_MAX / sizeof(T);
}
};
template <class T>
bool
operator==( const nsCppSharedAllocator<T>&, const nsCppSharedAllocator<T>& )
{
return true;
}
template <class T>
bool
operator!=( const nsCppSharedAllocator<T>&, const nsCppSharedAllocator<T>& )
{
return false;
}
#endif /* !defined(nsCppSharedAllocator_h__) */