derek.holloway
7502bf64a4
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42 lines
1.7 KiB
C++
42 lines
1.7 KiB
C++
// RUN: %clang_cc1 -fsyntax-only -verify -Wtautological-negation-compare -Wno-constant-logical-operand %s
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// RUN: %clang_cc1 -fsyntax-only -verify -Wtautological-compare -Wno-constant-logical-operand %s
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// RUN: %clang_cc1 -fsyntax-only -verify -Wall -Wno-unused -Wno-loop-analysis -Wno-constant-logical-operand %s
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#define COPY(x) x
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void test_int(int x) {
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if (x || !x) {} // expected-warning {{'||' of a value and its negation always evaluates to true}}
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if (!x || x) {} // expected-warning {{'||' of a value and its negation always evaluates to true}}
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if (x && !x) {} // expected-warning {{'&&' of a value and its negation always evaluates to false}}
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if (!x && x) {} // expected-warning {{'&&' of a value and its negation always evaluates to false}}
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// parentheses are ignored
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if (x || (!x)) {} // expected-warning {{'||' of a value and its negation always evaluates to true}}
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if (!(x) || x) {} // expected-warning {{'||' of a value and its negation always evaluates to true}}
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// don't warn on macros
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if (COPY(x) || !x) {}
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if (!x || COPY(x)) {}
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if (x && COPY(!x)) {}
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if (COPY(!x && x)) {}
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// dont' warn on literals
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if (1 || !1) {}
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if (!42 && 42) {}
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// don't warn on overloads
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struct Foo{
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int val;
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Foo operator!() const { return Foo{!val}; }
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bool operator||(const Foo other) const { return val || other.val; }
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bool operator&&(const Foo other) const { return val && other.val; }
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};
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Foo f{3};
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if (f || !f) {}
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if (!f || f) {}
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if (f.val || !f.val) {} // expected-warning {{'||' of a value and its negation always evaluates to true}}
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if (!f.val && f.val) {} // expected-warning {{'&&' of a value and its negation always evaluates to false}}
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}
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