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Fuse function and reference pointers

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This commit is contained in:
Steven Le Rouzic
2024-08-30 07:35:12 +02:00
parent 2cd972bb3e
commit f0a94256e2
3 changed files with 20 additions and 25 deletions
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2
asl/meta.hpp
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@ -2,8 +2,6 @@
namespace asl {
template<typename... Args> struct types {};
struct empty {};
template<typename T> struct id { using type = T; };

3
asl/meta_tests.cpp
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@ -161,4 +161,7 @@ static_assert(asl::is_same<int, asl::un_ref_t<int&>>);
static_assert(asl::is_same<int, asl::un_ref_t<int&&>>);
static_assert(asl::is_same<int() &, asl::un_ref_t<int() &>>);
using F = void(int) const &;
using Fr = asl::tame_t<F>&;
int main() { return 0; }

40
asl/ptr.hpp
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@ -11,16 +11,16 @@ namespace asl
template<is_object T, isize_t kLen>
struct span
{
static constexpr bool kDynamic = kLen < 0;
static constexpr bool kIsDynamic = kLen < 0;
using size_type = select_t<kDynamic, isize_t, empty>;
using size_type = select_t<kIsDynamic, isize_t, empty>;
constexpr span(T* begin, isize_t len) requires kDynamic
constexpr span(T* begin, isize_t len) requires kIsDynamic
: m_begin{begin}
, m_len{len}
{}
constexpr span(T* begin) requires (!kDynamic)
constexpr span(T* begin) requires (!kIsDynamic)
: m_begin{begin}
, m_len{}
{}
@ -79,32 +79,26 @@ struct object_metadata
constexpr auto deref(pointee* ptr) { return ptr; }
};
template<is_func T>
struct func_metadata
template<typename T>
struct ptr_like_metadata
{
using metadata = empty;
using pointee = tame_t<T>* const;
using pointee = un_ref_t<tame_t<T>>* const;
constexpr auto deref(pointee* ptr) { return *ptr; }
};
template<is_ref T>
struct ref_metadata
{
using metadata = empty;
using pointee = un_ref_t<T>* const;
constexpr auto deref(pointee* ptr) { return *ptr; }
};
template<is_void T> void_metadata<T> select_ptr_metadata(types<T>);
template<is_array T> array_metadata<T> select_ptr_metadata(types<T>);
template<is_object T> object_metadata<T> select_ptr_metadata(types<T>) requires (!is_array<T>);
template<is_func T> func_metadata<T> select_ptr_metadata(types<T>);
template<is_ref T> ref_metadata<T> select_ptr_metadata(types<T>);
template<typename T>
using metadata = decltype(select_ptr_metadata(types<T>{}));
constexpr auto select_ptr_metadata()
{
if constexpr (is_void<T>) return id<void_metadata<T>>{};
else if constexpr (is_array<T>) return id<array_metadata<T>>{};
else if constexpr (is_object<T>) return id<object_metadata<T>>{};
else return id<ptr_like_metadata<T>>{};
}
template<typename T>
using metadata = decltype(select_ptr_metadata<T>())::type;
} // namespace ptr_internal