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1 pmbaty 1 
#pragma once
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#include <type_traits>
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#include "dxxsconf.h"
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template <typename T>
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class exact_type
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{
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        T *p;
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public:
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        operator bool() const = delete;
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        // Conversion to void* variants is prohibited
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        operator void *() const = delete;
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        operator volatile void *() const = delete;
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        operator const void *() const = delete;
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        operator const volatile void *() const = delete;
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        template <typename U>
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                bool operator<(U &&) const = delete;
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        template <typename U>
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                bool operator<=(U &&) const = delete;
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        template <typename U>
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                bool operator>(U &&) const = delete;
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        template <typename U>
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                bool operator>=(U &&) const = delete;
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        template <typename U>
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                bool operator!=(U &&rhs) const { return !operator==(static_cast<U &&>(rhs)); }
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        exact_type(T *t) : p(t) {}
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        // Conversion to the exact type is permitted
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        operator const T *() const { return p; }
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        operator typename std::remove_const<T>::type *() const { return p; }
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        bool operator==(const T *rhs) const { return p == rhs; }
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};
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template <typename T>
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class prohibit_void_ptr
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{
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public:
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        // Return a proxy when the address is taken
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        exact_type<T> operator&() { return static_cast<T*>(this); }
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        exact_type<T const> operator&() const { return static_cast<T const*>(this); }
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};