clang/test/PCH/cxx20-template-args.cpp

   1 // RUN: %clang_cc1 -std=c++20 -include %s %s -o %t
   2
   3 // RUN: %clang_cc1 -std=c++20 -emit-pch %s -o %t
   4 // RUN: %clang_cc1 -std=c++20 -include-pch %t -verify %s
   5
   6 // expected-no-diagnostics
   7
   8 #ifndef HEADER
   9 #define HEADER
  10
  11 int g;
  12 struct A { union { int n, m; }; int *p; int A::*q; char buffer[32]; };
  13
  14 template<A a> constexpr const A &get = a;
  15
  16 constexpr const A &v = get<A{}>;
  17 constexpr const A &w = get<A{1, &g, &A::n, "hello"}>;
  18
  19 #else /*included pch*/
  20
  21 template<A a> constexpr const A &get2 = a;
  22
  23 constexpr const A &v2 = get2<A{}>;
  24 constexpr const A &w2 = get2<A{1, &g, &A::n, "hello\0\0\0\0\0"}>;
  25
  26 static_assert(&v == &v2);
  27 static_assert(&w == &w2);
  28
  29 static_assert(&v != &w);
  30 static_assert(&v2 != &w);
  31 static_assert(&v != &w2);
  32 static_assert(&v2 != &w2);
  33
  34 constexpr const A &v3 = get2<A{.n = 0}>;
  35 constexpr const A &x = get2<A{.m = 0}>;
  36
  37 static_assert(&v == &v3);
  38 static_assert(&v != &x);
  39
  40 #endif // HEADER