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