On 02/03/2012 04:18 PM, Michael Stahl wrote:
On 03/02/12 14:01, Stephan Bergmann wrote:
The "standard idiom" is
for (iterator i = m.begin(); i != m.end();) {
if (doErase) {
m.erase(i++);
} else {
++i;
}
}
but doesn't that have the same problem? "i" is incremented only after
the erase is complete, when "i" is already invalid.
No, i is incremented before calling erase in the above code.
The text you cite is about vector, for which *all* iterators into a
vector are invalidated upon an erase.
i think i read this "invalidate from position to end" in the SGI
documentation as well; does the actual standard give implementations
more freedom here?
Oh yes, vector erase only invalidates all the iterators after the point
of erase, not each and every iterator into the vector (i.e., it may not
reallocate the shrunk array to a smaller memory area). Sorry for the
confusion.
Stephan
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