D233 and emplace_hint

[Joaquín M López Muñoz]

Starting with D233 (http://www.open-std.org/jtc1/sc22/wg21/docs/lwg-
defects.html#233 ),
hinted insertion is more strictly specified than in C++03 so that the
hint can't be ignored and instead it designates very clearly where the
insertion (if it happens) will be done.

But emplace_hint does not follow suit, the note associated to
"a.emplace_hint(p, args)" in the latest C++0x draft (N3000) says:

"equivalent to a.emplace(std::forward<Args>(args)...). Return value
is an iterator
pointing to the element with the key equivalent to the newly
inserted element. The
const_iterator p is a hint pointing to where the search should
start.
Implementations are permitted to ignore the hint."

Is this a defect? Shouldn't emplace_hint provide guarantees about
the insertion point just as hinted insert does?

Joaqu�n M L�pez Mu�oz
Telef�nica, Investigaci�n y Desarrollo

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