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types.hpp: add PtrCastable concept

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This commit is contained in:
Nekotekina 2021-05-29 18:30:06 +03:00
parent d81a5b1423
commit eec9578619
2 changed files with 10 additions and 9 deletions
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12
rpcs3/util/shared_ptr.hpp
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@ -25,12 +25,6 @@ namespace stx
static thread_local const static thread_local const
#endif #endif
fake_t<std::remove_cv_t<T>> sample{}; fake_t<std::remove_cv_t<T>> sample{};
template <typename From, typename To, typename = void>
struct can_static_cast : std::false_type {};
template <typename From, typename To>
struct can_static_cast<From, To, std::void_t<decltype(static_cast<To>(std::declval<From>()))>> : std::true_type {};
} }
// Classify compile-time information available for pointers // Classify compile-time information available for pointers
@ -55,13 +49,13 @@ namespace stx
{ {
return same_ptr::yes; return same_ptr::yes;
} }
else if constexpr (detail::can_static_cast<U*, T*>::value && !std::is_abstract_v<U>) else if constexpr (PtrCastable<T, U> && !std::is_abstract_v<U>)
{ {
return is_same_ptr_test<T, U>() ? same_ptr::yes : same_ptr::no; return is_same_ptr_test<T, U>() ? same_ptr::yes : same_ptr::no;
} }
else if constexpr (detail::can_static_cast<T*, U*>::value && !std::is_abstract_v<T>) else if constexpr (PtrCastable<T, U> && !std::is_abstract_v<T>)
{ {
return is_same_ptr_test<U, T>() ? same_ptr::yes : same_ptr::no; return is_same_ptr_test<T, U>() ? same_ptr::yes : same_ptr::no;
} }
return same_ptr::maybe; return same_ptr::maybe;

7
rpcs3/util/types.hpp
View file

@ -1010,3 +1010,10 @@ constexpr auto fill_array(const T&... args)
{ {
return fill_array_t<T...>{{args...}}; return fill_array_t<T...>{{args...}};
} }
template <typename X, typename Y>
concept PtrCastable = requires(const volatile X* x, const volatile Y* y)
{
static_cast<const volatile Y*>(x);
static_cast<const volatile X*>(y);
};