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

// RUN: %clang_cc1 -fsyntax-only -Wstring-conversion -verify %s

// Warn on cases where a string literal is converted into a bool.
// An exception is made for this in logical and operators.
void assert(bool condition);
void test0() {
  bool b0 = "hi"; // expected-warning{{implicit conversion turns string literal into bool: 'const char[3]' to 'bool'}}
  b0 = ""; // expected-warning{{implicit conversion turns string literal into bool: 'const char[1]' to 'bool'}}
  b0 = 0 || ""; // expected-warning{{implicit conversion turns string literal into bool: 'const char[1]' to 'bool'}}
  b0 = "" || 0; // expected-warning{{implicit conversion turns string literal into bool: 'const char[1]' to 'bool'}}
  b0 = 0 && "";
  b0 = "" && 0;
  assert("error"); // expected-warning{{implicit conversion turns string literal into bool: 'const char[6]' to 'bool'}}
  assert(0 || "error"); // expected-warning{{implicit conversion turns string literal into bool: 'const char[6]' to 'bool'}}
  assert("error" || 0); // expected-warning{{implicit conversion turns string literal into bool: 'const char[6]' to 'bool'}}
  assert(0 && "error");
  assert("error" && 0);

  while("hi") {} // expected-warning{{implicit conversion turns string literal into bool: 'const char[3]' to 'bool'}}
  do {} while("hi"); // expected-warning{{implicit conversion turns string literal into bool: 'const char[3]' to 'bool'}}
  for (;"hi";); // expected-warning{{implicit conversion turns string literal into bool: 'const char[3]' to 'bool'}}
  if("hi") {} // expected-warning{{implicit conversion turns string literal into bool: 'const char[3]' to 'bool'}}
}