64 lines
1.4 KiB
C++
64 lines
1.4 KiB
C++
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// RUN: %clang_cc1 -fsyntax-only -verify %s
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// PR4103 : Make sure we don't get a bogus unused expression warning
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namespace PR4103 {
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class APInt {
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char foo;
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};
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class APSInt : public APInt {
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char bar;
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public:
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APSInt &operator=(const APSInt &RHS);
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};
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APSInt& APSInt::operator=(const APSInt &RHS) {
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APInt::operator=(RHS);
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return *this;
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}
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template<typename T>
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struct X {
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X();
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};
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void test() {
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X<int>();
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}
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}
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namespace derefvolatile {
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void f(volatile char* x) {
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*x; // expected-warning {{expression result unused; assign into a variable to force a volatile load}}
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(void)*x; // expected-warning {{expression result unused; assign into a variable to force a volatile load}}
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volatile char y = 10;
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(void)y; // don't warn here, because it's a common pattern.
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}
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}
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// <rdar://problem/12359208>
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namespace AnonObject {
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struct Foo {
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Foo(const char* const message);
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~Foo();
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};
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void f() {
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Foo("Hello World!"); // don't warn
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int(1); // expected-warning {{expression result unused}}
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}
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}
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// Test that constructing an object (which may have side effects) with
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// constructor arguments which are dependent doesn't produce an unused value
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// warning.
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namespace UnresolvedLookup {
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struct Foo {
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Foo(int i, int j);
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};
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template <typename T>
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struct Bar {
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void f(T t) {
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Foo(t, 0); // no warning
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}
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};
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}
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