Re: [Boost-users] [boost-users] [parameter] test\preprocessor.cpp

1 Jun 2006

      Cromwell Enage wrote:
...
--- Daniel Wallin wrote:
...
Cromwell Enage wrote:
...
My own code is using outdated syntax.  Looks like
I have to add those default values into my
BOOST_PARAMETER_FUNCTION calls.
Right. The older syntax is still supported, but with
new names:
BOOST_PARAMETER_BASIC_*
That's good to know, because I haven't figured out how
to reimplement most of my graph algorithms using the
new syntax, due to interdependencies between their
default values.
We are in the process of updating the documentation for the new syntax.
The rule regarding interdependencies is that arguments may depend on
previous arguments. So for instance:

  BOOST_PARAMETER_FUNCTION(
    (void), f, tag,

    (required
      (x, *)
      (y, *))
    (optional
      (z, *, x + z)
      (u, *, z))
  )

is OK. And:

  f(x = 1, y = 2)

is equivalent to

  f(x = 1, y = 2, z = 1 + 2, u = 1 + 2)

-- 
Daniel Wallin