From: Mark Rodgers (mark.rodgers_at_[hidden])
Date: 2000-11-22 03:42:23
John,
I don't know if this helps you at all, but I did manage to get your
challenge to compile by changing this line
#define value_test(v, x) checker<(v == x)>::check(v, x, #x);
to this
#define value_test(v, x) \
enum { BOOST_JOIN(foo, __LINE__) = x }; \
checker<(v == x)>::check(v, x, #x);
#define BOOST_JOIN( X, Y ) BOOST_DO_JOIN( X, Y )
#define BOOST_DO_JOIN( X, Y ) X##Y
It seems that the usage of is_convertible::value as the value for
an enum forces the compiler to treat it as a compile time constant
henceforth. Weird!
I don't know if we can do anything about it other than provide
documentation to this effect so that users can use this workaround.
Mark