i-c-e-cxx.cpp revision 41bf4f38348561a0f12c10d34f1673cd19a6eb04
1// RUN: %clang_cc1 -fsyntax-only -verify -pedantic %s
2
3// C++-specific tests for integral constant expressions.
4
5const int c = 10;
6int ar[c];
7
8struct X0 {
9  static const int value = static_cast<int>(4.0);
10};
11
12void f() {
13  if (const int value = 17) {
14    int array[value];
15  }
16}
17
18int a() {
19  const int t=t;
20  switch(1) { // expected-warning {{no case matching constant switch condition '1'}}
21    case t:; // expected-error {{not an integer constant expression}}
22  }
23}
24
25// PR6206:  out-of-line definitions are legit
26namespace pr6206 {
27  class Foo {
28  public:
29    static const int kBar;
30  };
31
32  const int Foo::kBar = 20;
33
34  char Test() {
35    char str[Foo::kBar];
36    str[0] = '0';
37    return str[0];
38  }
39}
40
41// PR6373:  default arguments don't count.
42void pr6373(const unsigned x = 0) {
43  unsigned max = 80 / x;
44}
45
46
47// rdar://9204520
48namespace rdar9204520 {
49
50struct A {
51  static const int B = int(0.75 * 1000 * 1000); // expected-warning {{not a constant expression, accepted as an extension}}
52};
53
54int foo() { return A::B; }
55}
56
57// PR11040
58const int x = 10;
59int* y = reinterpret_cast<const char&>(x); // expected-error {{cannot initialize}}
60
61// This isn't an integral constant expression, but make sure it folds anyway.
62struct PR8836 { char _; long long a; }; // expected-warning {{long long}}
63int PR8836test[(__typeof(sizeof(int)))&reinterpret_cast<const volatile char&>((((PR8836*)0)->a))]; // expected-warning {{folded to constant array as an extension}}
64
65const int nonconst = 1.0;
66int arr[nonconst]; // expected-warning {{folded to constant array as an extension}}
67const int castfloat = static_cast<int>(1.0);
68int arr2[castfloat]; // ok
69
70extern const int &Recurse1;
71const int &Recurse2 = Recurse1, &Recurse1 = Recurse2;
72