[boost] Re: class static constants, mpl, and linker problems

Matthias Troyer <troyer@itp.phys.ethz.ch> writes:

Dear Daniel,

If you use BOOST_STATIC_CONSTANT you need to additionally provide a definition on conforming compilers. The correct usage is like in:

// declaration class A { BOOST_STATIC_CONSTANT(int , x=1); };

....

//definition #ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION int A::x; #endif

I hope that clarifies this issue,

Another approach is to use mpl::int_<n> or integral_c<T,n> which supply the definitions themselves. -- Dave Abrahams Boost Consulting www.boost-consulting.com