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Postings from November 2010
Rafael Garcia-Suarez wrote: >Can you give an example of future usage of "?" you were thinking about ? The issue that came up was the possibility of adding a "?" postfix to existing infix operators. We were specifically talking about adding to "->", making "->?", but this particular case doesn't suffer from ?pat?, because "->" isn't an infix operator in that sense -- it's a postfix operator, and the syntax that follows the "->" is very restricted, not a general expression. Potential operators that would be affected by it include "*?", "=?", and so on. They currently run into the problem that "$a=?$b" looks like the start of a valid parse, and will tokenise as "$ a = ?$b". It's difficult to construct a complete expression that could be interpreted either way, but the tokeniser needs to decide between the two interpretations of the question mark without considering how later parts of the expression will parse. I don't think we have any specific semantics in mind for new operators using a "?", apart from the unproblematic "->?" (for which we have multiple possible meanings). -zeframThread Previous | Thread Next