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SKILL++: Changing += to apply for user-defined classes

liorscotland

Hello. I have a class, and I want to use += in order to apply the =+ inits' context. Kind of .= in PERL, or += for dynamic arrays in Ruby.
I want, however, that the old =+ functionality for folat and fixnum stay.
Any ideas?
Thanks.

  • Hi Lior,

    I'm not entirely sure what you mean by "apply the =+ inits' context". 

    When you use the += operator, it's translated from:

    a+=x

    to:

    setf(a a+x)

    You can define the setf updater function using defsetf() - this was partly covered in the Advanced SKILL training (that you were on). It's also possible to override what the + operator does in a lexical scope by defining a local function plus with different behaviour. I don't really want to dive into giving an example of doing this without better understanding what you're hoping to achieve, as otherwise I may just add rather than subtract confusion!

    By the way, there is no =+ operator in SKILL - the parser will not recognise it - only +=.

    Regards,

    Andrew.

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