clang/test/PCH/cxx1z-aligned-alloc.cpp

   1 // No PCH:
   2 // RUN: %clang_cc1 -pedantic -fsized-deallocation -std=c++1z -include %s -verify %s
   3 //
   4 // With PCH:
   5 // RUN: %clang_cc1 -pedantic -fsized-deallocation -std=c++1z -emit-pch %s -o %t
   6 // RUN: %clang_cc1 -pedantic -fsized-deallocation -std=c++1z -include-pch %t -verify %s
   7
   8 // RUN: %clang_cc1 -pedantic -fsized-deallocation -std=c++1z -emit-pch -fpch-instantiate-templates %s -o %t
   9 // RUN: %clang_cc1 -pedantic -fsized-deallocation -std=c++1z -include-pch %t -verify %s
  10
  11 // expected-no-diagnostics
  12
  13 #ifndef HEADER
  14 #define HEADER
  15
  16 using size_t = decltype(sizeof(0));
  17
  18 // Call the overaligned form of 'operator new'.
  19 struct alignas(256) Q { int n; };
  20 void *f() { return new Q; }
  21
  22 // Extract the std::align_val_t type from the implicit declaration of operator delete.
  23 template<typename AlignValT>
  24 AlignValT extract(void (*)(void*, size_t, AlignValT));
  25 using T = decltype(extract(&operator delete));
  26
  27 #else
  28
  29 // ok, calls aligned allocation via placement syntax
  30 void *q = new (T{16}) Q;
  31
  32 namespace std {
  33   enum class align_val_t : size_t {};
  34 }
  35
  36 using T = std::align_val_t; // ok, same type
  37
  38 #endif