[libcxx-commits] [libcxx] ee28f5d - [libc++] Make __is_less_than_compatable a variable template (#202525)

[via libcxx-commits]

Author: Nikolas Klauser
Date: 2026-06-10T11:06:50+02:00
New Revision: ee28f5d4a3ed32c2759516983f66988e31ea1824

URL: https://github.com/llvm/llvm-project/commit/ee28f5d4a3ed32c2759516983f66988e31ea1824
DIFF: https://github.com/llvm/llvm-project/commit/ee28f5d4a3ed32c2759516983f66988e31ea1824.diff

LOG: [libc++] Make __is_less_than_compatable a variable template (#202525)

This makes the code a bit more readable and improves compile times a
bit, since variable templates are faster to instantiate than class
templates.

Added: 
    

Modified: 
    libcxx/include/__utility/is_pointer_in_range.h

Removed: 
    


################################################################################
diff  --git a/libcxx/include/__utility/is_pointer_in_range.h b/libcxx/include/__utility/is_pointer_in_range.h
index 8e1b86b16df8b..8daa12e935239 100644
--- a/libcxx/include/__utility/is_pointer_in_range.h
+++ b/libcxx/include/__utility/is_pointer_in_range.h
@@ -26,13 +26,13 @@
 _LIBCPP_BEGIN_NAMESPACE_STD
 
 template <class _Tp, class _Up, class = void>
-struct __is_less_than_comparable : false_type {};
+inline const bool __is_less_than_comparable_v = false;
 
 template <class _Tp, class _Up>
-struct __is_less_than_comparable<_Tp, _Up, __void_t<decltype(std::declval<_Tp>() < std::declval<_Up>())> > : true_type {
-};
+inline const bool
+    __is_less_than_comparable_v<_Tp, _Up, __void_t<decltype(std::declval<_Tp>() < std::declval<_Up>())> > = true;
 
-template <class _Tp, class _Up, __enable_if_t<__is_less_than_comparable<const _Tp*, const _Up*>::value, int> = 0>
+template <class _Tp, class _Up, __enable_if_t<__is_less_than_comparable_v<const _Tp*, const _Up*>, int> = 0>
 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_SANITIZE("address") bool
 __is_pointer_in_range(const _Tp* __begin, const _Tp* __end, const _Up* __ptr) {
   _LIBCPP_ASSERT_VALID_INPUT_RANGE(std::__is_valid_range(__begin, __end), "[__begin, __end) is not a valid range");
@@ -47,7 +47,7 @@ __is_pointer_in_range(const _Tp* __begin, const _Tp* __end, const _Up* __ptr) {
   return !__less<>()(__ptr, __begin) && __less<>()(__ptr, __end);
 }
 
-template <class _Tp, class _Up, __enable_if_t<!__is_less_than_comparable<const _Tp*, const _Up*>::value, int> = 0>
+template <class _Tp, class _Up, __enable_if_t<!__is_less_than_comparable_v<const _Tp*, const _Up*>, int> = 0>
 _LIBCPP_CONSTEXPR_SINCE_CXX14 _LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_SANITIZE("address") bool
 __is_pointer_in_range(const _Tp* __begin, const _Tp* __end, const _Up* __ptr) {
   if (__libcpp_is_constant_evaluated())