[boost] question re has_trivial_contructor type trait

From: Robert Ramey (ramey_at_[hidden])
Date: 2004-12-02 14:29:42

The documentation for has_trivial_constructor has some cryptic note:
Without some (as yet unspecified) help from the compiler,
has_trivial_constructor will never report that a class or struct has a
trivial constructor; this is always safe, if possibly sub-optimal.

What does this mean - it sounds like its of new use - then why is it there?

Robert Ramey