On Fri, Sep 9, 2016 at 8:36 PM, K leo <cnbiz...@gmail.com> wrote: > Bart, > > Can you explain what you mean by "need to be rooted"? The jl_new_struct > statement as Isaiah suggested works, why do we need the additional > statements as you suggested? >
Because it doesn't, it'll segfault at any time if the GC feels like giving you a bad day. http://julia.readthedocs.io/en/latest/manual/embedding/#memory-management > > > On Saturday, September 10, 2016 at 3:38:27 AM UTC+8, Bart Janssens wrote: >> >> >> >> On Fri, Sep 9, 2016 at 6:44 PM Isaiah Norton <isaiah...@gmail.com> wrote: >> >>> // construct a TestType instance >>> >>> jl_value_t* jl_A = jl_new_struct((jl_datatype_t*) >>> jl_get_function((jl_module_t*)mod, "TestType"), >>> jl_box_float64(A.a), >>> jl_box_float64(A.b)); >>> >>> >> The arguments to jl_new_struct need to be rooted, so you should do >> something like: >> jl_value_t* a = NULL; >> jl_value_t* b = NULL; >> JL_GC_PUSH2(a,b); >> a = jl_box_float64(A.a); >> b = jl_box_float64(A.b); >> // use a and b in the new struct call >> JL_GC_POP(); >> >> What is the objective here? If this is still to be used from C++, there >> may be easier ways using Cxx.jl or CxxWrap.jl. >> >> Cheers, >> >> Bart >> >
