On Sun, Jan 22, 2006 at 08:53:45AM +0100, Clemens Hintze wrote:
> Sorry for bothering, but - while it is true, that the C++ standard was
> written in a manner that allow copy-on-write technics for implementation
> of basic_string, it does not mandate to do so!
>
> Further it seems, that there are situations, where copy-on-write will
> behave worser than a simple plain implementation - thread safety comes
> to mind. See for example
>
> http://www.gotw.ca/publications/optimizations.htm
>
> In this light it could not being impossible, that STL vendors could
> leave the copy-on-write path.
Yes. But it happens that
1) monotone currently only builds on g++ (or if not, then certainly
by far the vast majority of its use is with g++, on all major
platforms)
2) we know that in fact g++'s std::string is CoW, so can optimize
with that in mind
-- Nathaniel
--
Details are all that matters; God dwells there, and you never get to
see Him if you don't struggle to get them right. -- Stephen Jay Gould
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