[libcxx-commits] [libcxx] [libc++] P3391R2: `constexpr` integral overloads of `to_(w)string` (PR #205025)

[Nikolas Klauser via libcxx-commits]

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@@ -3798,17 +3807,123 @@ stoull(const wstring& __str, size_t* __idx = nullptr, int __base = 10);
 [[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI double stod(const wstring& __str, size_t* __idx = nullptr);
 [[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI long double stold(const wstring& __str, size_t* __idx = nullptr);
 
+#    if _LIBCPP_STD_VER < 26 || defined(_LIBCPP_PREFERRED_OVERLOAD)
 [[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(int __val);
 [[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(unsigned __val);
 [[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(long __val);
 [[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(unsigned long __val);
 [[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(long long __val);
 [[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(unsigned long long __val);
+#    endif // _LIBCPP_STD_VER < 26 || defined(_LIBCPP_PREFERRED_OVERLOAD)
+
 [[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(float __val);
 [[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(double __val);
 [[__nodiscard__]] _LIBCPP_EXPORTED_FROM_ABI wstring to_wstring(long double __val);
 #  endif // _LIBCPP_HAS_WIDE_CHARACTERS
 
+#  if _LIBCPP_STD_VER >= 26
+
+// Note: _LIBCPP_ALWAYS_INLINE is used for generating direct invocations to dylib versions for Clang,
+// which avoids code size regression in C++26.
+
+template <class _String, class _Integer>
+constexpr _String __integer_to_string(_Integer __val) {
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philnik777 wrote:

Yes, this is in an explicit ABI area.

https://github.com/llvm/llvm-project/pull/205025