clang/test/PCH/cxx2a-compare.cpp

   1 // RUN: %clang_cc1 -pedantic-errors -std=c++2a -emit-pch  %s -o %t
   2 // RUN: %clang_cc1 -pedantic-errors -std=c++2a -include-pch %t -verify %s
   3 // RUN: %clang_cc1 -pedantic-errors -std=c++2a -include-pch %t -emit-llvm %s -o -
   4
   5
   6 #ifndef HEADER
   7 #define HEADER
   8
   9 #include "Inputs/std-compare.h"
  10 constexpr auto foo() {
  11   return (42 <=> 101);
  12 }
  13
  14 inline auto bar(int x) {
  15   return (1 <=> x);
  16 }
  17
  18 struct X {
  19   int a;
  20   friend constexpr std::strong_ordering operator<=>(const X &x, const X &y) {
  21     return x.a <=> y.a;
  22   }
  23 };
  24 constexpr auto baz(int x) {
  25   return X{3} < X{x};
  26 }
  27
  28 #else
  29
  30 // expected-no-diagnostics
  31
  32 static_assert(foo() < 0);
  33
  34 auto bar2(int x) {
  35   return bar(x);
  36 }
  37
  38 static_assert(!baz(3));
  39 static_assert(baz(4));
  40
  41 #endif