clang/test/SemaCXX/warn-string-conversion.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -Wstring-conversion -verify %s
   2
   3 // Warn on cases where a string literal is converted into a bool.
   4 // An exception is made for this in logical and operators.
   5 void assert(bool condition);
   6 void test0() {
   7   bool b0 = "hi"; // expected-warning{{implicit conversion turns string literal into bool: 'const char[3]' to 'bool'}}
   8   b0 = ""; // expected-warning{{implicit conversion turns string literal into bool: 'const char[1]' to 'bool'}}
   9   b0 = 0 || ""; // expected-warning{{implicit conversion turns string literal into bool: 'const char[1]' to 'bool'}}
  10   b0 = "" || 0; // expected-warning{{implicit conversion turns string literal into bool: 'const char[1]' to 'bool'}}
  11   b0 = 0 && "";
  12   b0 = "" && 0;
  13   assert("error"); // expected-warning{{implicit conversion turns string literal into bool: 'const char[6]' to 'bool'}}
  14   assert(0 || "error"); // expected-warning{{implicit conversion turns string literal into bool: 'const char[6]' to 'bool'}}
  15   assert("error" || 0); // expected-warning{{implicit conversion turns string literal into bool: 'const char[6]' to 'bool'}}
  16   assert(0 && "error");
  17   assert("error" && 0);
  18
  19   while("hi") {} // expected-warning{{implicit conversion turns string literal into bool: 'const char[3]' to 'bool'}}
  20   do {} while("hi"); // expected-warning{{implicit conversion turns string literal into bool: 'const char[3]' to 'bool'}}
  21   for (;"hi";); // expected-warning{{implicit conversion turns string literal into bool: 'const char[3]' to 'bool'}}
  22   if("hi") {} // expected-warning{{implicit conversion turns string literal into bool: 'const char[3]' to 'bool'}}
  23 }
  24