Re: [Boost-users] regex tr1 constructor

From: John Maddock (john_at_[hidden])
Date: 2008-04-05 11:18:07

gast128 wrote:
> Dear all,
>
> Peter Becker's book 'the c++ standard library extensions' describes
> various tr1::regex constructors. One of them is the following
> (16.4.2, p.387):
>
> char expr1[] = "abc[d-f]";
> regex rgx2(expr1, 3);
>
>> From the boost headers I can see that it picks up the wrong
>> costructor, since
> the constructor with length specification has 3 arguments (and the
> last has no default specification). Who is wrong?

Well, since I wrote that section of TR1 (as well as Boost.Regex), and also 
helped proofread Pete's book, I guess you can blame me either way :-)

The relevent constructors taken straight out of TR1 are:

explicit basic_regex(const charT* p, flag_type f = 
regex_constants::ECMAScript);
basic_regex(const charT* p, size_t len, flag_type f);

So the version that takes a length always needs 3 arguments (this is also 
the case in the current draft for the next std).

HTH, John.