[boost] [boost.variant] It is possible to make a variant LessThanComparable

From: Dirk Schreib (Dirk.Schreib_at_[hidden])
Date: 2003-08-30 10:25:31

I would like a variant to be LessThanComparable if all
BoundedTypes are LessThanComparable.

In this example

  typedef boost::variant<T1, T2, ..., TN> V;
  V v1 = T1( x );
  V v2 = T2( y );
  V v3 = T1( z );

v1 < v2 should always be true. And v1 < v3 should be the same as T1( x ) <
T1( z ).

I assume that the resulting variant class will be StrictWeaklyComparable if
all
BoundedTypes are StrictWeaklyComparable.

Dirk