Per Lisandro's comments: I think that if you need a random/valid value for an STL map (or similar), malloc(0) is not a good idea to use as a key.
OK, regarding comments in this thread, you are completelly right. I am fine with returning NULL. BTW, should'nt this issue be commented in the standard? Perhaps in the errata document? I think there is no a strong need to make it implementation dependent. MPI-2 could mandate/suggest that if size=0, the returned pointer is NULL, but then MPI_Free_mem with a NULL pointer should succeed. Now a question: What about Fortran ? -- Lisandro Dalcín --------------- Centro Internacional de Métodos Computacionales en Ingeniería (CIMEC) Instituto de Desarrollo Tecnológico para la Industria Química (INTEC) Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET) PTLC - Güemes 3450, (3000) Santa Fe, Argentina Tel/Fax: +54-(0)342-451.1594
