Are +, -, +=, -=, etc. redefinable methods?

ruby-talk
1

If so, is there some magic syntax to define them?

Thanks!

2

-= and += are special forms that represent:

  y -= x ~> y = y - x
  y += x ~> y = y + x

A number of other infix operators can be used in the same way. So these are
not redefinable independent of + and -.

+ and - on the otherhand has two forms, infix and unary. (Unary means prefix
operator.)

Infix

  def +(x)
    #...
  end

  def -(x)
    #...
  end

Unary

  def +@
    #...
  end

  def -@
    #...
  end

HTH,
T

···

On Friday 12 November 2004 11:13 pm, itsme213 wrote:

If so, is there some magic syntax to define them?

Thanks!

3

Hi,

···

On Sat, 13 Nov 2004 13:39:31 +0900, trans. (T. Onoma) <transami@runbox.com> wrote:

On Friday 12 November 2004 11:13 pm, itsme213 wrote:
> If so, is there some magic syntax to define them?
>
> Thanks!

-= and += are special forms that represent:

  y -= x ~> y = y - x
  y += x ~> y = y + x

A number of other infix operators can be used in the same way. So these are
not redefinable independent of + and -.

+ and - on the otherhand has two forms, infix and unary. (Unary means prefix
operator.)

Also, for a chart of all the operators and details on their
method-ness, look here:
http://phrogz.net/ProgrammingRuby/language.html#operatorexpressions

cheers,
Mark