94 lines
4.1 KiB
C++
94 lines
4.1 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -fcxx-exceptions -verify -Wno-unused -Wunused-comparison %s
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struct A {
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bool operator==(const A&);
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bool operator!=(const A&);
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A operator|=(const A&);
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operator bool();
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};
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void test() {
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int x, *p;
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A a, b;
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x == 7; // expected-warning {{equality comparison result unused}} \
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// expected-note {{use '=' to turn this equality comparison into an assignment}}
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x != 7; // expected-warning {{inequality comparison result unused}} \
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// expected-note {{use '|=' to turn this inequality comparison into an or-assignment}}
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7 == x; // expected-warning {{equality comparison result unused}}
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p == p; // expected-warning {{equality comparison result unused}} \
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// expected-note {{use '=' to turn this equality comparison into an assignment}} \
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// expected-warning {{self-comparison always evaluates to true}}
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a == a; // expected-warning {{equality comparison result unused}} \
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// expected-note {{use '=' to turn this equality comparison into an assignment}}
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a == b; // expected-warning {{equality comparison result unused}} \
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// expected-note {{use '=' to turn this equality comparison into an assignment}}
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a != b; // expected-warning {{inequality comparison result unused}} \
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// expected-note {{use '|=' to turn this inequality comparison into an or-assignment}}
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A() == b; // expected-warning {{equality comparison result unused}}
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if (42) x == 7; // expected-warning {{equality comparison result unused}} \
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// expected-note {{use '=' to turn this equality comparison into an assignment}}
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else if (42) x == 7; // expected-warning {{equality comparison result unused}} \
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// expected-note {{use '=' to turn this equality comparison into an assignment}}
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else x == 7; // expected-warning {{equality comparison result unused}} \
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// expected-note {{use '=' to turn this equality comparison into an assignment}}
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do x == 7; // expected-warning {{equality comparison result unused}} \
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// expected-note {{use '=' to turn this equality comparison into an assignment}}
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while (false);
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while (false) x == 7; // expected-warning {{equality comparison result unused}} \
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// expected-note {{use '=' to turn this equality comparison into an assignment}}
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for (x == 7; // expected-warning {{equality comparison result unused}} \
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// expected-note {{use '=' to turn this equality comparison into an assignment}}
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x == 7; // No warning -- result is used
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x == 7) // expected-warning {{equality comparison result unused}} \
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// expected-note {{use '=' to turn this equality comparison into an assignment}}
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x == 7; // expected-warning {{equality comparison result unused}} \
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// expected-note {{use '=' to turn this equality comparison into an assignment}}
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switch (42) default: x == 7; // expected-warning {{equality comparison result unused}} \
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// expected-note {{use '=' to turn this equality comparison into an assignment}}
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switch (42) case 42: x == 7; // expected-warning {{equality comparison result unused}} \
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// expected-note {{use '=' to turn this equality comparison into an assignment}}
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switch (42) {
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case 1:
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case 2:
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default:
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case 3:
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case 4:
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x == 7; // expected-warning {{equality comparison result unused}} \
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// expected-note {{use '=' to turn this equality comparison into an assignment}}
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}
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(void)(x == 7);
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(void)(p == p); // expected-warning {{self-comparison always evaluates to true}}
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{ bool b = x == 7; }
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{ bool b = ({ x == 7; // expected-warning {{equality comparison result unused}} \
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// expected-note {{use '=' to turn this equality comparison into an assignment}}
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x == 7; }); } // no warning on the second, its result is used!
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#define EQ(x,y) (x) == (y)
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EQ(x, 5);
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#undef EQ
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}
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namespace PR10291 {
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template<typename T>
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class X
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{
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public:
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X() : i(0) { }
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void foo()
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{
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throw
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i == 0u ?
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5 : 6;
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}
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private:
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int i;
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};
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X<int> x;
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}
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