[boost] Is there any interest in library, that emulates Pascal\'s \'in\' syntax

From: sdanil (sdspam_at_[hidden])
Date: 2003-11-03 10:02:32

Hi!

In Pascal we can write following code:

procedure Foo( ch : Char )
Begin
  if ( ch in [\'a\', \'b\', \'v\'..\'z\'] ) Then
    begin
     ...
    end
End;

But this syntax is unavailable in C/C++. (I know, that
we can use switch/case syntax, but it\'s awkward in many
cases)
I suggest \'one_of\' library, which provides following
code:

void foo( char ch )
{
  if ( one_of( ch ) % \'a\' % \'b\' % range( \'v\',
\'z\' ) )
  {
    ...
  }
}

There are three cases of usage:
1) one_of( <value> ) % <constant>
2) one_of( <value> ) % range( <lo_constant>,
<hi_constant> )
3) one_of( <value> ) % suite( <begin_iterator>,
<end_iterator> )

All three cases can be combined in arbitrary ways.

Source code of one_of library in attachment.