97 lines
2 KiB
C++
97 lines
2 KiB
C++
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// RUN: %clang_cc1 -fsyntax-only -verify -std=c++11 %s
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int f() __attribute__((warn_unused_result));
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struct S {
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void t() const;
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};
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S g1() __attribute__((warn_unused_result));
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S *g2() __attribute__((warn_unused_result));
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S &g3() __attribute__((warn_unused_result));
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void test() {
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f(); // expected-warning {{ignoring return value}}
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g1(); // expected-warning {{ignoring return value}}
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g2(); // expected-warning {{ignoring return value}}
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g3(); // expected-warning {{ignoring return value}}
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(void)f();
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(void)g1();
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(void)g2();
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(void)g3();
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if (f() == 0) return;
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g1().t();
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g2()->t();
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g3().t();
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int i = f();
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S s1 = g1();
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S *s2 = g2();
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S &s3 = g3();
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const S &s4 = g1();
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}
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struct X {
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int foo() __attribute__((warn_unused_result));
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};
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void bah() {
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X x, *x2;
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x.foo(); // expected-warning {{ignoring return value}}
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x2->foo(); // expected-warning {{ignoring return value}}
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}
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namespace warn_unused_CXX11 {
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struct [[clang::warn_unused_result]] Status {
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bool ok() const;
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Status& operator=(const Status& x);
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inline void Update(const Status& new_status) {
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if (ok()) {
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*this = new_status; //no-warning
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}
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}
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};
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Status DoSomething();
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Status& DoSomethingElse();
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Status* DoAnotherThing();
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Status** DoYetAnotherThing();
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void lazy() {
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Status s = DoSomething();
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if (!s.ok()) return;
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Status &rs = DoSomethingElse();
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if (!rs.ok()) return;
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Status *ps = DoAnotherThing();
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if (!ps->ok()) return;
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Status **pps = DoYetAnotherThing();
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if (!(*pps)->ok()) return;
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(void)DoSomething();
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(void)DoSomethingElse();
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(void)DoAnotherThing();
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(void)DoYetAnotherThing();
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DoSomething(); // expected-warning {{ignoring return value}}
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DoSomethingElse(); // expected-warning {{ignoring return value}}
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DoAnotherThing(); // expected-warning {{ignoring return value}}
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DoYetAnotherThing();
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}
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}
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namespace PR17587 {
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struct [[clang::warn_unused_result]] Status;
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struct Foo {
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Status Bar();
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};
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struct Status {};
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void Bar() {
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Foo f;
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f.Bar(); // expected-warning {{ignoring return value}}
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};
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}
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