On 09/04/2015 02:55 PM, Mint wrote:
On Friday, 4 September 2015 at 17:17:26 UTC, Andrei Alexandrescu wrote:
On 09/03/2015 01:08 PM, H. S. Teoh via Digitalmars-d wrote:
[...]
Is there a way for the lexer to check for the specific character
sequence '=', '+', whitespace and not others (e.g. '=', whitespace,
'+')? IOW, "a =+ b" will be prohibited, but "a = + b" will be allowed.
If so, I agree with this.
Yah, space is relevant there. That's why the check is easiest done
during tokenization. -- Andrei
Given ` a =+ b `, I see no issue with the statement assuming 'b' is of
some type T that overloads the unary + operator. ie. ` a = b.opUnary!"+" `
And while the expression could also be written as ` a = +b `, there's a
number of situations where it's hard to control the formatting (ie.
generated mixin code). That, and I can't think of any other C-like
language where ` =+ ` would produce an error.
A simple solution would be to just have unary + perform integer
promotion, as it does in C.
I am now sorry I started this. -- Andrei
