clang/test/SemaCXX/bool.cpp

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