48 lines
1.4 KiB
C++
48 lines
1.4 KiB
C++
#pragma once
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#include "dxxsconf.h"
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#include "compiler-type_traits.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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bool operator<(exact_type<T>) const = delete;
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bool operator<=(exact_type<T>) const = delete;
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bool operator>(exact_type<T>) const = delete;
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bool operator>=(exact_type<T>) const = delete;
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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 T *() const { return p; }
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bool operator==(exact_type<T> rhs) const { return p == rhs.p; }
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bool operator!=(exact_type<T> rhs) const { return p != rhs.p; }
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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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};
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struct allow_void_ptr {};
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template <typename T>
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struct has_prohibit_void_ptr : tt::is_base_of<prohibit_void_ptr<T>, T> {};
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template <typename T>
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struct has_prohibit_void_ptr<T[]> {};
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template <typename T, typename D>
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struct inherit_void_ptr_handler : public
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tt::conditional<has_prohibit_void_ptr<T>::value, prohibit_void_ptr<D>, allow_void_ptr> {};
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