digitalmars.D.bugs - [Issue 24648] New: Power operator should be unordered with unary
- d-bugmail puremagic.com (26/26) Jul 04 https://issues.dlang.org/show_bug.cgi?id=24648
https://issues.dlang.org/show_bug.cgi?id=24648 Issue ID: 24648 Summary: Power operator should be unordered with unary prefix, not stronger Product: D Version: D2 Hardware: All OS: All Status: NEW Severity: enhancement Priority: P1 Component: dmd Assignee: nobody puremagic.com Reporter: qs.il.paperinik gmail.com In mathematics texts, exponentiation binds stronger than unary prefix, that is, −2² = −(2²) = −4. I guess for this reason, in D, where exponentiation is a binary operator: `^^`, it also binds stronger than unary prefix operators. It’s the only exception to this rule: Unary operators bind stronger than binary ones. (Another is the template instantiation operator, for which the exception makes sense.) I suggest we make `^^` unordered with respect to unary prefix operators, that is, make `-x^^2` a parse error and the error message should tell the programmer that clarifying parentheses are needed: `(-x)^^2` or `-(x^^2)`. This is a similar situation as with comparison operators and bit-wise operators. --
Jul 04