54 lines
1.3 KiB
C++
54 lines
1.3 KiB
C++
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// RUN: %clang_cc1 -std=c++11 -fsyntax-only -verify -Wunused-value %s
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void f() __attribute__((const));
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namespace PR18571 {
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// Unevaluated contexts should not trigger unused result warnings.
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template <typename T>
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auto foo(T) -> decltype(f(), bool()) { // Should not warn.
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return true;
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}
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void g() {
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foo(1);
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}
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void h() {
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int i = 0;
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(void)noexcept(++i); // expected-warning {{expression with side effects has no effect in an unevaluated context}}
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decltype(i++) j = 0; // expected-warning {{expression with side effects has no effect in an unevaluated context}}
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}
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struct S {
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S operator++(int);
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S(int i);
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S();
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int& f();
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S g();
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};
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void j() {
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S s;
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int i = 0;
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(void)noexcept(s++); // Ok
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(void)noexcept(i++); // expected-warning {{expression with side effects has no effect in an unevaluated context}}
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(void)noexcept(i = 5); // expected-warning {{expression with side effects has no effect in an unevaluated context}}
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(void)noexcept(s = 5); // Ok
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(void)sizeof(s.f()); // Ok
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(void)sizeof(s.f() = 5); // expected-warning {{expression with side effects has no effect in an unevaluated context}}
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(void)noexcept(s.g() = 5); // Ok
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}
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}
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namespace volatile_array {
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void test() {
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char a[10];
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volatile char b[10];
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a; // expected-warning-re {{expression result unused{{$}}}}
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b; // expected-warning-re {{expression result unused{{$}}}}
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}
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}
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