SGI 标准的空间配置器 std::allocator

// Inclusion of this file is DEPRECATED.  This is the original HP
// default allocator.  It is provided only for backward compatibility.
// 
// DO NOT USE THIS FILE unless you have an old container implementation
// that requires an allocator with the HP-style interface.  SGI STL
// uses a different allocator interface.  SGI-style allocators are not
// parametrized with respect to the object type; they traffic in void *
// pointers.  This file is not included by any other SGI STL header.

template <class T>
inline T* allocate(ptrdiff_t size, T*) {
    set_new_handler(0);
    T* tmp = (T*)(::operator new((size_t)(size * sizeof(T))));
    if (tmp == 0) {
    cerr << "out of memory" << endl; 
    exit(1);
    }
    return tmp;
}


template <class T>
inline void deallocate(T* buffer) {
    ::operator delete(buffer);
}

template <class T>
class allocator {
public:
    typedef T value_type;
    typedef T* pointer;
    typedef const T* const_pointer;
    typedef T& reference;
    typedef const T& const_reference;
    typedef size_t size_type;
    typedef ptrdiff_t difference_type;
    pointer allocate(size_type n) { 
    return ::allocate((difference_type)n, (pointer)0);
    }
    void deallocate(pointer p) { ::deallocate(p); }
    pointer address(reference x) { return (pointer)&x; }
    const_pointer const_address(const_reference x) { 
    return (const_pointer)&x; 
    }
    size_type init_page_size() { 
    return max(size_type(1), size_type(4096/sizeof(T))); 
    }
    size_type max_size() const { 
    return max(size_type(1), size_type(UINT_MAX/sizeof(T))); 
    }
};

class allocator<void> {
public:
    typedef void* pointer;
};

不建议使用，性能不好，仅仅是封装了::operator new 和 ::operator delete
这里需要使用std::alloc