String literal as template parameter?

Hi all,

I was thinking about language feature allowing convert string literal
into variadic character pack (char...).

Here is real life use case, which comes from Yard parser library
(http://yard-parser.sourceforge.net/cgi-bin/index.cgi).
It shall define parser that matches sequence of characters.
Exact implementation doesn't matter.

It has been slightly modified to use variadic templates

template <char Char1_, char Char2_, char...MoreChars_>
class CharSeq
{
    static const unsigned int length = sizeof...(MoreChars_) + 2;

    inline static char get_nth(unsigned int n);

public:
    template <typename ParserState_>
    static bool match(ParserState_& state);
};

typedef CharSeq<'c', 'a', 't', 'c', 'h'> CatchKeyword;
// which could be:
//typedef CharSeq<"catch"> CatchKeyword;

There is proposal of 'User-defined literals' (http://www.open-std.org/
jtc1/sc22/wg21/docs/papers/2007/n2378.pdf), but atleast in my
understanding, it fails to provide way of doing that.

Is my assumption is correct?
If yes, what are technical reasons from preventing that?

Cheers, Piotr Rak

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