[libcxx-commits] [PATCH] D102332: [libc++][nfc] remove duplicated __to_unsigned.

Mark de Wever via Phabricator via libcxx-commits libcxx-commits at lists.llvm.org
Wed May 12 08:52:11 PDT 2021

Mordante created this revision.
Mordante added reviewers: cjdb, zoecarver.
Mordante requested review of this revision.
Herald added a project: libc++.
Herald added a subscriber: libcxx-commits.
Herald added a reviewer: libc++.

Both `<type_traits>` and `<charconv>` implemented this function with
different names and a slightly different behavior. This removes the
version in `<charconv>` and improves the version in `<typetraits>`.

- The code can be used again in C++11.
- The original claimed C++14 support, but `[[nodiscard]]` is not available in  C++14.
- Uses the name from `<charconv>`.

  rG LLVM Github Monorepo



Index: libcxx/include/type_traits
--- libcxx/include/type_traits
+++ libcxx/include/type_traits
@@ -2309,12 +2309,13 @@
 #if _LIBCPP_STD_VER > 11
 template <class _Tp> using make_unsigned_t = typename make_unsigned<_Tp>::type;
-template<class _From>
-[[nodiscard]] constexpr auto __to_unsigned_like(_From __x) noexcept {
-  return static_cast<make_unsigned_t<_From>>(__x);
+template <class _Tp>
+typename make_unsigned<_Tp>::type __to_unsigned(_Tp __x) noexcept {
+    return static_cast<typename make_unsigned<_Tp>::type>(__x);
 #if _LIBCPP_STD_VER > 14
 template <class...> using void_t = void;
Index: libcxx/include/charconv
--- libcxx/include/charconv
+++ libcxx/include/charconv
@@ -331,13 +331,6 @@
     return _Tp(~__x + 1);
-template <typename _Tp>
-inline _LIBCPP_INLINE_VISIBILITY typename make_unsigned<_Tp>::type
-__to_unsigned(_Tp __x)
-    return static_cast<typename make_unsigned<_Tp>::type>(__x);
 template <typename _Tp>
 inline _LIBCPP_INLINE_VISIBILITY to_chars_result
Index: libcxx/include/__ranges/size.h
--- libcxx/include/__ranges/size.h
+++ libcxx/include/__ranges/size.h
@@ -89,7 +89,7 @@
     template<__difference _Tp>
     [[nodiscard]] constexpr __integer_like auto operator()(_Tp&& __t) const
         noexcept(noexcept(ranges::end(__t) - ranges::begin(__t))) {
-      return __to_unsigned_like<range_difference_t<remove_cvref_t<_Tp>>>(
+      return __to_unsigned<range_difference_t<remove_cvref_t<_Tp>>>(
           ranges::end(__t) - ranges::begin(__t));

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