clang/test/SemaCXX/string-plus-char.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -std=c++11 -verify %s
   2
   3 class A {
   4 public:
   5   A(): str() { }
   6   A(const char *p) { }
   7   A(char *p) : str(p + 'a') { } // expected-warning {{adding 'char' to a string pointer does not append to the string}} expected-note {{use array indexing to silence this warning}}
   8   A& operator+(const char *p) { return *this; }
   9   A& operator+(char ch) { return *this; }
  10   char * str;
  11 };
  12
  13 void f(const char *s) {
  14   A a = s + 'a'; // // expected-warning {{adding 'char' to a string pointer does not append to the string}} expected-note {{use array indexing to silence this warning}}
  15   a = a + s + 'b'; // no-warning
  16
  17   char *str = 0;
  18   char *str2 = str + 'c'; // expected-warning {{adding 'char' to a string pointer does not append to the string}} expected-note {{use array indexing to silence this warning}}
  19
  20   const char *constStr = s + 'c'; // expected-warning {{adding 'char' to a string pointer does not append to the string}} expected-note {{use array indexing to silence this warning}}
  21
  22   str = 'c' + str;// expected-warning {{adding 'char' to a string pointer does not append to the string}} expected-note {{use array indexing to silence this warning}}
  23
  24   wchar_t *wstr;
  25   wstr = wstr + L'c'; // expected-warning {{adding 'wchar_t' to a string pointer does not append to the string}} expected-note {{use array indexing to silence this warning}}
  26   str2 = str + u'a'; // expected-warning {{adding 'char16_t' to a string pointer does not append to the string}} expected-note {{use array indexing to silence this warning}}
  27
  28   // no-warning
  29   char c = 'c';
  30   str = str + c;
  31   str = c + str;
  32 }