1 // RUN: %clang_cc1 -fsyntax-only -verify -Wunused-value %s 2 3 // PR4806 4 namespace test0 { 5 class Box { 6 public: 7 int i; 8 volatile int j; 9 }; 10 11 void doit() { 12 // pointer to volatile has side effect (thus no warning) 13 Box* box = new Box; 14 box->i; // expected-warning {{expression result unused}} 15 box->j; // expected-warning {{expression result unused}} 16 } 17 } 18 19 namespace test1 { 20 struct Foo { 21 int i; 22 bool operator==(const Foo& rhs) { 23 return i == rhs.i; 24 } 25 }; 26 27 #define NOP(x) (x) 28 void b(Foo f1, Foo f2) { 29 NOP(f1 == f2); // expected-warning {{expression result unused}} 30 } 31 #undef NOP 32 } 33 34 namespace test2 { 35 extern "C" { 36 namespace std { 37 template<typename T> struct basic_string { 38 struct X {}; 39 void method() const { 40 X* x; 41 &x[0]; // expected-warning {{expression result unused}} 42 } 43 }; 44 typedef basic_string<char> string; 45 void func(const std::string& str) { 46 str.method(); // expected-note {{in instantiation of member function}} 47 } 48 } 49 } 50 } 51 52
