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43 lines
1.2 KiB
C++
43 lines
1.2 KiB
C++
//
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// Allocator that locks its contents from being paged
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// out of memory and clears its contents before deletion.
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//
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template<typename T>
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struct secure_allocator : public std::allocator<T>
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{
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// MSVC8 default copy constructor is broken
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typedef std::allocator<T> base;
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typedef typename base::size_type size_type;
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typedef typename base::difference_type difference_type;
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typedef typename base::pointer pointer;
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typedef typename base::const_pointer const_pointer;
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typedef typename base::reference reference;
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typedef typename base::const_reference const_reference;
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typedef typename base::value_type value_type;
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secure_allocator() throw() {}
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secure_allocator(const secure_allocator& a) throw() : base(a) {}
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template <typename U>
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secure_allocator(const secure_allocator<U>& a) throw() : base(a) {}
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~secure_allocator() throw() {}
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template<typename _Other> struct rebind
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{ typedef secure_allocator<_Other> other; };
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T* allocate(std::size_t n, const void *hint = 0)
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{
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T *p;
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p = std::allocator<T>::allocate(n, hint);
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if (p != NULL)
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mlock(p, sizeof(T) * n);
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return p;
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}
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void deallocate(T* p, std::size_t n)
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{
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if (p != NULL)
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{
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memset(p, 0, sizeof(T) * n);
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munlock(p, sizeof(T) * n);
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}
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std::allocator<T>::deallocate(p, n);
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}
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}; |