clang/test/SemaCXX/ms-constexpr-new.cpp

   1 // RUN: %clang_cc1 -fms-compatibility -fms-compatibility-version=19.33 -std=c++20 -verify=supported %s
   2 // RUN: %clang_cc1 -fms-compatibility -fms-compatibility-version=19.32 -std=c++20 -verify=unsupported %s
   3 // supported-no-diagnostics
   4
   5 [[nodiscard]]
   6 [[msvc::constexpr]] // unsupported-warning {{unknown attribute 'constexpr' ignored}}
   7 inline void* operator new(decltype(sizeof(void*)), void* p) noexcept { return p; }
   8
   9 namespace std {
  10   constexpr int* construct_at(int* p, int v) {
  11     [[msvc::constexpr]] return ::new (p) int(v); // unsupported-warning {{unknown attribute 'constexpr' ignored}}
  12   }
  13 }
  14
  15 constexpr bool check_construct_at() { int x; return *std::construct_at(&x, 42) == 42; }
  16 static_assert(check_construct_at());