Hi! On Fri, Oct 24, 2003 at 11:01:15AM +0100, John Fletcher wrote:
symbol x("x"); ex example("x+1",lst(x));
// This produces a compile time message // Internal error: statement in file real/conv/cl_R_to_double.cc, // line 55 has been reached!! // Please send the authors of the program a description // how you produced this error!
double val = ( ex_to<numeric>( example ) ).to_double();
You call ex_to<numeric>(example), but 'example' is a sum, not a numeric. When you call ex_to<T> on an expression that isn't a T, you're in deep doodoo. You should check the type of the expression first, like this: double val; if (is_a<numeric>(example)) val = ex_to<numeric>(example).to_double(); else // report error, load 'val' with default value, or something else Bye, Christian -- / Physics is an algorithm \/ http://www.uni-mainz.de/~bauec002/