File: constraints.cpp

package info (click to toggle)
llvm-toolchain-17 1%3A17.0.6-22
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 1,799,624 kB
  • sloc: cpp: 6,428,607; ansic: 1,383,196; asm: 793,408; python: 223,504; objc: 75,364; f90: 60,502; lisp: 33,869; pascal: 15,282; sh: 9,684; perl: 7,453; ml: 4,937; awk: 3,523; makefile: 2,889; javascript: 2,149; xml: 888; fortran: 619; cs: 573
file content (25 lines) | stat: -rw-r--r-- 1,243 bytes parent folder | download | duplicates (12)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
// RUN: %clang_cc1 -std=c++20 -verify %s
// RUN: %clang_cc1 -std=c++20 -verify %s -DDEPENDENT_OR

#ifdef DEPENDENT_OR
// This causes the || below to be a CXXOperatorCallExpr not a BinaryOperator.
struct A {}; bool operator||(A, A);
#endif

namespace PR45589 {
  template<typename T> struct X { static constexpr bool value = T::value; }; // expected-error {{cannot be used prior to '::'}}
  struct False { static constexpr bool value = false; };
  struct True { static constexpr bool value = true; };

  template<typename T> concept C = true;

  template<bool B, typename T> constexpr int test = 0;
  template<bool B, typename T> requires C<T> constexpr int test<B, T> = 1;
  template<bool B, typename T> requires (B && C<T>) || (X<T>::value && C<T>) constexpr int test<B, T> = 2; // expected-note {{instantiation of}} expected-note {{while substituting}}
  static_assert(test<true, False> == 2);
  static_assert(test<true, True> == 2);
  static_assert(test<true, char> == 2); // satisfaction of second term of || not considered
  static_assert(test<false, False> == 1);
  static_assert(test<false, True> == 2); // constraints are partially ordered
  static_assert(test<false, char> == 1); // expected-note {{while}} expected-note {{during}}
}