Nathaniel Smith wrote:
On Sat, Jan 21, 2006 at 03:11:51AM -0600, Timothy Brownawell wrote:
(...)
Aren't strings copy-on-write anyway, so this shouldn't be a problem?
Oh, hrm. That's a clever point.
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.
Best regards,
Clemens.
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