44 lines
1.3 KiB
C++
44 lines
1.3 KiB
C++
#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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constexpr exact_type(T *t) : p(t) {}
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// Conversion to the exact type is permitted
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constexpr operator const T *() const { return p; }
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constexpr operator typename std::remove_const<T>::type *() const { return p; }
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constexpr bool operator==(const T *rhs) const { return p == rhs; }
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[[nodiscard]]
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constexpr bool operator==(const exact_type<T> &rhs) const = default;
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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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constexpr exact_type<T> operator&() { return static_cast<T*>(this); }
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constexpr exact_type<T const> operator&() const { return static_cast<T const*>(this); }
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};
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