72 lines
1.4 KiB
C++
72 lines
1.4 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify -Wunused-value %s
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// PR4806
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namespace test0 {
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class Box {
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public:
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int i;
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volatile int j;
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};
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void doit() {
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// pointer to volatile has side effect (thus no warning)
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Box* box = new Box;
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box->i; // expected-warning {{expression result unused}}
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box->j; // expected-warning {{expression result unused}}
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}
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}
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namespace test1 {
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struct Foo {
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int i;
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bool operator==(const Foo& rhs) {
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return i == rhs.i;
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}
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};
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#define NOP(x) (x)
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void b(Foo f1, Foo f2) {
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NOP(f1 == f2); // expected-warning {{expression result unused}}
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}
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#undef NOP
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}
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namespace test2 {
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extern "C++" {
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namespace std {
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template<typename T> struct basic_string {
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struct X {};
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void method() const {
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X* x;
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&x[0]; // expected-warning {{expression result unused}}
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}
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};
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typedef basic_string<char> string;
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void func(const std::string& str) {
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str.method(); // expected-note {{in instantiation of member function}}
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}
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}
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}
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}
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namespace test3 {
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struct Used {
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Used();
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Used(int);
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Used(int, int);
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};
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struct __attribute__((warn_unused)) Unused {
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Unused();
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Unused(int);
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Unused(int, int);
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};
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void f() {
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Used();
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Used(1);
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Used(1, 1);
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Unused(); // expected-warning {{expression result unused}}
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Unused(1); // expected-warning {{expression result unused}}
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Unused(1, 1); // expected-warning {{expression result unused}}
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}
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}
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