L$$m$Ll$l$l$ ------Original Message------ From: Eric Niebler Sender: boost-users-bounces@lists.boost.org To: boost-users@lists.boost.org ReplyTo: boost-users@lists.boost.org Sent: Apr 7, 2009 10:21 AM Subject: Re: [Boost-users] [mpl]... is there an mpl::string Noah Roberts wrote:

Eric Niebler wrote:

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Andy Stevenson wrote:

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I recall some discussion of there being an mpl::string template..... Can't see it in the mpl library. Is it elsewhere?

It has been added to trunk as of revision 52208:

https://svn.boost.org/trac/boost/changeset/52208

No doubt the regression tests will reveal portability problems. Once they have been worked out, we can move this to release.

Why is this better than a metafunction c_str< Sequence >?

typedef mpl::vector_c<char, 'h', 'e', 'l', 'l', 'o'> str;

template < char const* sz > struct x {};

x< c_str<str>::value > test;

Is there some reason that's not possible or is prone to problems avoided by mpl::string?

That is certainly a valid design. It's somewhat subjective, but IMO multi-character literals give a nicer compile-time string interface. Consider: // With mpl::vector_c mpl::vector_c<char, 'h','e','l','l','o',' ','w','o','r','l','d'> // With mpl::string mpl::string<'hell','o wo','rld'> Neither will win a beauty contest, but my preference is strongly for the latter. -- Eric Niebler BoostPro Computing http://www.boostpro.com _______________________________________________ Boost-users mailing list Boost-users@lists.boost.org http://lists.boost.org/mailman/listinfo.cgi/boost-users Sent from my Verizon Wireless BlackBerry