clang/test/PCH/cxx2a-defaulted-comparison.cpp

   1 // RUN: %clang_cc1 -std=c++2a -verify -Wno-defaulted-function-deleted -include %s %s
   2 //
   3 // RUN: %clang_cc1 -std=c++2a -emit-pch %s -o %t.pch
   4 // RUN: %clang_cc1 -std=c++2a -include-pch %t.pch %s -verify
   5 //
   6 // RUN: %clang_cc1 -std=c++2a -emit-pch -fpch-instantiate-templates %s -o %t.pch
   7 // RUN: %clang_cc1 -std=c++2a -include-pch %t.pch %s -verify
   8
   9 // expected-no-diagnostics
  10
  11 #ifndef INCLUDED
  12 #define INCLUDED
  13
  14 namespace std {
  15   struct strong_ordering {
  16     int n;
  17     constexpr operator int() const { return n; }
  18     static const strong_ordering equal, greater, less;
  19   };
  20   constexpr strong_ordering strong_ordering::equal = {0};
  21   constexpr strong_ordering strong_ordering::greater = {1};
  22   constexpr strong_ordering strong_ordering::less = {-1};
  23 }
  24
  25 // Ensure that we can round-trip DefaultedFunctionInfo through an AST file.
  26 namespace LookupContext {
  27   struct A {};
  28
  29   namespace N {
  30     template <typename T> auto f() {
  31       bool operator==(const T &, const T &);
  32       bool operator<(const T &, const T &);
  33       struct B {
  34         T a;
  35         std::strong_ordering operator<=>(const B &) const = default;
  36       };
  37       return B();
  38     }
  39   }
  40 }
  41
  42 #else
  43
  44 namespace LookupContext {
  45   namespace M {
  46     bool operator<=>(const A &, const A &) = delete;
  47     bool operator==(const A &, const A &) = delete;
  48     bool operator<(const A &, const A &) = delete;
  49     bool cmp = N::f<A>() < N::f<A>();
  50   }
  51 }
  52
  53 #endif