#include <boost/qvm/quat_operations.hpp>
namespace boost
{
namespace qvm
{
//Only enabled if:
// is_quat<A>::value && is_quat<B>::value
template <class A,class B>
A & operator*=( A & a, B const & b );
}
}
As if:
A tmp(a);
a = tmp * b;
return a;