Skip to content

[libc++] Simplify the implementation of tuple_size #162260

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Closed
wants to merge 1 commit into from
Closed

[libc++] Simplify the implementation of tuple_size #162260

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
16 changes: 4 additions & 12 deletions libcxx/include/__tuple/tuple_size.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -12,11 +12,7 @@
#include <__config>
#include <__cstddef/size_t.h>
#include <__fwd/tuple.h>
#include <__tuple/tuple_types.h>
#include <__type_traits/enable_if.h>
#include <__type_traits/integral_constant.h>
#include <__type_traits/is_const.h>
#include <__type_traits/is_volatile.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
# pragma GCC system_header
Expand All @@ -32,18 +28,14 @@ template <class _Tp, class...>
using __enable_if_tuple_size_imp _LIBCPP_NODEBUG = _Tp;

template <class _Tp>
struct tuple_size<
__enable_if_tuple_size_imp<const _Tp, __enable_if_t<!is_volatile<_Tp>::value>, decltype(tuple_size<_Tp>::value)>>
: public integral_constant<size_t, tuple_size<_Tp>::value> {};
struct tuple_size<__enable_if_tuple_size_imp<const _Tp, decltype(tuple_size<_Tp>::value)>> : tuple_size<_Tp> {};

template <class _Tp>
struct tuple_size<
__enable_if_tuple_size_imp<volatile _Tp, __enable_if_t<!is_const<_Tp>::value>, decltype(tuple_size<_Tp>::value)>>
: public integral_constant<size_t, tuple_size<_Tp>::value> {};
struct tuple_size<__enable_if_tuple_size_imp<volatile _Tp, decltype(tuple_size<_Tp>::value)>> : tuple_size<_Tp> {};

template <class _Tp>
struct tuple_size<__enable_if_tuple_size_imp<const volatile _Tp, decltype(tuple_size<_Tp>::value)>>
: public integral_constant<size_t, tuple_size<_Tp>::value> {};
struct tuple_size<__enable_if_tuple_size_imp<const volatile _Tp, decltype(tuple_size<_Tp>::value)>> : tuple_size<_Tp> {
};

#else
template <class _Tp>
Expand Down
Loading