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Improve exact_type comparison operators

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This commit is contained in:
Kp 2016-02-06 22:12:54 +00:00
parent 198540d080
commit 92e6987c2c
1 changed files with 15 additions and 9 deletions
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24
common/include/pack.h
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@ -3,7 +3,7 @@
#include "dxxsconf.h"
#include "compiler-type_traits.h"
template <typename T>
template <typename T, typename Trc = typename tt::remove_const<T>::type>
class exact_type
{
T *p;
@ -14,15 +14,21 @@ public:
operator volatile void *() const = delete;
operator const void *() const = delete;
operator const volatile void *() const = delete;
bool operator<(exact_type<T>) const = delete;
bool operator<=(exact_type<T>) const = delete;
bool operator>(exact_type<T>) const = delete;
bool operator>=(exact_type<T>) const = delete;
template <typename U>
bool operator<(U &&) const = delete;
template <typename U>
bool operator<=(U &&) const = delete;
template <typename U>
bool operator>(U &&) const = delete;
template <typename U>
bool operator>=(U &&) const = delete;
template <typename U>
bool operator!=(U &&rhs) const { return !operator==(static_cast<U &&>(rhs)); }
exact_type(T *t) : p(t) {}
// Conversion to the exact type is permitted
operator T *() const { return p; }
bool operator==(exact_type<T> rhs) const { return p == rhs.p; }
bool operator!=(exact_type<T> rhs) const { return p != rhs.p; }
operator const T *() const { return p; }
operator Trc *() const { return p; }
bool operator==(const T *rhs) const { return p == rhs; }
};
template <typename T>
@ -31,7 +37,7 @@ class prohibit_void_ptr
public:
// Return a proxy when the address is taken
exact_type<T> operator&() { return static_cast<T*>(this); }
exact_type<T const> operator&() const { return static_cast<T const*>(this); }
exact_type<T const, T> operator&() const { return static_cast<T const*>(this); }
};
struct allow_void_ptr {};