File: argument-dependent-lookup.cpp

package info (click to toggle)
llvm-toolchain-11 1%3A11.0.1-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye
  • size: 995,808 kB
  • sloc: cpp: 4,767,656; ansic: 760,916; asm: 477,436; python: 170,940; objc: 69,804; lisp: 29,914; sh: 23,855; f90: 18,173; pascal: 7,551; perl: 7,471; ml: 5,603; awk: 3,489; makefile: 2,573; xml: 915; cs: 573; fortran: 503; javascript: 452
file content (45 lines) | stat: -rw-r--r-- 985 bytes parent folder | download | duplicates (24) 
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
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
 
// RUN: %clang_cc1 -std=c++14 -verify %s
// RUN: %clang_cc1 -std=c++14 -verify %s -DHAVE_UNQUALIFIED_LOOKUP_RESULTS
// expected-no-diagnostics

namespace address_of {
#ifdef HAVE_UNQUALIFIED_LOOKUP_RESULTS
  struct Q {};
  void operator&(Q);
#endif

  template<typename T> struct A {
    static constexpr auto x = &T::value;
  };

  template<typename T> struct B {
    constexpr int operator&() { return 123; }
  };

  template<typename T> struct C {
    static_assert(sizeof(T) == 123, "");
  };

  struct X1 {
    static B<X1> value;
  };
  struct X2 : B<X2> {
    enum E { value };
    friend constexpr int operator&(E) { return 123; }
  };

  struct Y1 {
    C<int> *value;
  };
  struct Y2 {
    C<int> value();
  };

  // ok, uses ADL to find operator&:
  static_assert(A<X1>::x == 123, "");
  static_assert(A<X2>::x == 123, "");

  // ok, does not use ADL so does not instantiate C<T>:
  static_assert(A<Y1>::x == &Y1::value, "");
  static_assert(A<Y2>::x == &Y2::value, "");
}