-- Prof. Roberto Bagnara Computer Science Group Department of Mathematics, University of Parma, Italy http://www.cs.unipr.it/~bagnara/ mailto:bagnara@cs.unipr.it /* The GMP 4.x documentation says: mpz_class& mpq_class::get_num () mpz_class& mpq_class::get_den () Get a reference to an `mpz_class' which is the numerator or denominator of an `mpq_class'. This can be used both for read and write access. If the object returned is modified, it modifies the original `mpq_class'. However, the following simple wrapper, gives, with GCC 3.0.4 $ g++ -W -Wall -c gmpbug.cc gmpbug.cc: In function `mpz_class& numerator(mpq_class&)': gmpbug.cc:24: could not convert `__gmp_expr<__gmpq_value, __gmpq_value>::get_num()' to `mpz_class&' */ #include <gmpxx.h> mpz_class& numerator(mpq_class& r) { return r.get_num(); }