Re: [Boost-users] Concatenation of many std::string

From: Jim Lear (jim.lear_at_[hidden])
Date: 2005-02-11 14:14:11

So, I assume the '...' paramater, a la printf, is all but forbidden.  It's
too bad there no good way to pass a variable number of arguments in C++.
 Of course one could pass a vector of std::string references, but I'm beyond
my feeble abilities to understand the performance affects of constructing
a temporary vector.

t. scott urban wrote:
> On Fri, 2005-02-11 at 10:39 -0600, Jim Lear wrote:
> > No, fastcat does not exist.  I'm suggesting that it may be easier for
> > Chateauneu to create an optimized method (fastcat or such) that
> > accepts multiple operands rather than wrestling with operators that
> > accept only two operands. 
> >   
>
> You're probably right.  You could do something like.
>
> using std::string
> void fastcat (string & dest, const string & s1);
> void fastcat (string & dest, const string & s1, const string & s2);
> etc
>
> Explicit unrolling of the loops in my toy concat class.  Unless you only
> have a few cases you care about, this is tedious.
>
> It's probably to use some template machinery and or preprocessor magic
> to create a form that takes an arbitrary (up to some limit) number of
> strings to concatenate. 
>
> Another option is to rely on the compilers intimate knowledge of it's
> own library implementations to do all this for you.  Don't know of real
> compilers do this, but it seems like a reasonable request.

-- 
Jim Lear
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