std::string::reserve()

[Neil Ferguson]

Paolo Carlini wrote:

<snip>

 > The standard is like this exactly because wants to make possible
 > an efficient refcopied implementation.

In other words, it's better to make correct usage as efficient as
possible, even at the expense of guarding against unsafe usage.

You're right.

I surrender :-)

_M_set_sharable() call added, regtested i686-linux, diffs attached.

Neil.
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