Re: [Boost-users] [boost] [switch_] Case Concept [ was Re: formal review of Switch library...]

12 Jan 2008

      AMDG

Tobias Schwinger wrote:
...
Joel de Guzman wrote:
...
c0, c1, ... cN          Returns a fusion sequence of Case objects
seemingly equivalent to
(c0, c1, ... cN)
(note: Application of comma operator ;-)).
?! Why doesn't it just return another (compound) Case object and leave 
the Sequence an unspecified implementation detail...
So you want switch_ to be

  template
  requires Case<Cases> && BuiltInIntegerOrEnum<I>
  R switch(I i, Cases cases);

IMO, There is a very big problem here.
Suppose that you have a fusion sequence that holds your
cases and function objects coming from somewhere else.
The problem of adapting it to switch_ is no easier than it
would be with my original interface.

In Christ,
Steven Watanabe