1 // RUN: %clang_cc1 %std_cxx98-14 -fsyntax-only -verify=expected,precxx17 -Wno-constant-conversion %s
2 // RUN: %clang_cc1 %std_cxx98-14 -fsyntax-only -verify=expected,precxx17 -Wno-constant-conversion -Wno-deprecated -Wdeprecated-increment-bool %s
3 // RUN: %clang_cc1 %std_cxx17- -fsyntax-only -verify=expected,cxx17 -Wno-constant-conversion -Wno-deprecated -Wdeprecated-increment-bool %s
4
5 // RUN: %clang_cc1 %std_cxx98-14 -fsyntax-only -verify=expected,precxx17 -Wno-constant-conversion %s -fexperimental-new-constant-interpreter
6 // RUN: %clang_cc1 %std_cxx98-14 -fsyntax-only -verify=expected,precxx17 -Wno-constant-conversion -Wno-deprecated -Wdeprecated-increment-bool %s -fexperimental-new-constant-interpreter
7 // RUN: %clang_cc1 %std_cxx17- -fsyntax-only -verify=expected,cxx17 -Wno-constant-conversion -Wno-deprecated -Wdeprecated-increment-bool %s -fexperimental-new-constant-interpreter
8
9
10 // Bool literals can be enum values.
11 enum {
12 ReadWrite = false,
13 ReadOnly = true
14 };
15
16 // bool cannot be decremented, and gives a warning on increment
test(bool b)17 void test(bool b)
18 {
19 ++b; // precxx17-warning {{incrementing expression of type bool is deprecated}} \
20 cxx17-error {{ISO C++17 does not allow incrementing expression of type bool}}
21 b++; // precxx17-warning {{incrementing expression of type bool is deprecated}} \
22 cxx17-error {{ISO C++17 does not allow incrementing expression of type bool}}
23 --b; // expected-error {{cannot decrement expression of type bool}}
24 b--; // expected-error {{cannot decrement expression of type bool}}
25
26 bool *b1 = (int *)0; // expected-error{{cannot initialize}}
27 }
28
29 // static_assert_arg_is_bool(x) compiles only if x is a bool.
30 template <typename T>
static_assert_arg_is_bool(T x)31 void static_assert_arg_is_bool(T x) {
32 bool* p = &x;
33 }
34
test2()35 void test2() {
36 int n = 2;
37 static_assert_arg_is_bool(n && 4); // expected-warning {{use of logical '&&' with constant operand}} \
38 // expected-note {{use '&' for a bitwise operation}} \
39 // expected-note {{remove constant to silence this warning}}
40 static_assert_arg_is_bool(n || 5); // expected-warning {{use of logical '||' with constant operand}} \
41 // expected-note {{use '|' for a bitwise operation}}
42 }
43