[boost] Macros at namespace scope: trailing semicolon?

From: David Abrahams (dave_at_[hidden])
Date: 2005-07-14 12:15:50

I am defining a macro, 

  BOOST_PARAMETER_KEYWORD(tag_namespace, name)

that declares a keyword for the Parameter library.  It has to be used
at namespace scope.  I have the option to define it so that correct
usage requires a trailing semicolon, or so that the trailing semicolon
is forbidden.  Unfortunately I don't have the ability to make it
optional.  Which should I choose?

IMO there's no chance of confusing it with a function call, since a
function call would be illegal in the context in which it's used, and
people are naturally more likely to add a semicolon without thinking
about it, and if I design the macro so that a semicolon is required it
will interact more smoothly with editors and pretty-printers.  So I
can't see any good reason not to require the semicolon.  Arguments?

-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com