File: constraints.cpp

package info (click to toggle)
swiftlang 6.0.3-2
  • links: PTS, VCS
  • area: main
  • in suites: forky, sid, trixie
  • size: 2,519,992 kB
  • sloc: cpp: 9,107,863; ansic: 2,040,022; asm: 1,135,751; python: 296,500; objc: 82,456; f90: 60,502; lisp: 34,951; pascal: 19,946; sh: 18,133; perl: 7,482; ml: 4,937; javascript: 4,117; makefile: 3,840; awk: 3,535; xml: 914; fortran: 619; cs: 573; ruby: 573
file content (25 lines) | stat: -rw-r--r-- 1,243 bytes parent folder | download | duplicates (14)
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}}
}