Eric Milles created GROOVY-10394:
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Summary: SC: operands evaluated multiple times for <=> operator on
reference types
Key: GROOVY-10394
URL: https://issues.apache.org/jira/browse/GROOVY-10394
Project: Groovy
Issue Type: Bug
Components: Static compilation
Reporter: Eric Milles
Assignee: Eric Milles
Similar to GROOVY-7473, consider the following:
{code:groovy}
@groovy.transform.CompileStatic
class C {
int i = 0, j = 1
Integer getA() { i++ }
Integer getB() { j++ }
void test() {
assert (a <=> b) == -1
print i
print j
}
}
new C().test()
{code}
In cases where "a" and "b" are not identical and non-null, each is evaluated 3
times. This is not good if "a" and "b" are expensive to compute or have side
effects.
{{a <=> b}} is transformed into {{a === b ? 0 : (a == null ? -1 : (b == null ?
1 : a.compareTo(b)))}} by {{BinaryExpressionTransformer}}.
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