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From: Joe Gottman (jgottman_at_[hidden])
Date: 2003-03-24 20:37:34

   It would be nice if boost::optional<T> had operator< defined whenever
operator< was defined for T. This would allow us to use optional<T> as the
key of an associative container. I suggest the following semantics:

bool operator<(optional<T> const &x, optional<T> const &y);

Returns: If y is uninitialized, false. If y is initialized and x is
uninitialized, true. If x and y are both initialized, (*x < *y).

   This results in a strict weak ordering with uninitialized optional<T>
objects being sorted first.

Joe Gottman

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