e.g. http://half.sourceforge.net/
But if you aren't sure you need to support this, then just throw an error (Float16 is relatively new and AFAICT only useful in specialized applications because of the precision limit, which is why support is rare) If you are sure you (a) need it but (b) only need to up- and down-convert, see the routines in `base/float.jl`. They should be straightforward to port to C++. On Wed, Oct 19, 2016 at 1:00 PM, Yichao Yu <[email protected]> wrote: > > > On Wed, Oct 19, 2016 at 12:54 PM, Kyle Kotowick <[email protected]> wrote: > >> Aha, that fixed it! >> >> I'm running into one issue though. What do I do with the data when it's a >> "Float16" type? C++ has no way to represent a 16-bit float, so I'm having >> difficulty converting it to a regular 32-bit float. >> > > Find a compiler / library that supports it? ;-p > > I'm only half joking. You can always just keep a pointer to the value or > store it in a int16_t as long as you don't need to do any operation on it. > If you want to operate on them in C++ natively you would have to find a > C/C++ compiler/library (or write the necessary operations yourself) that > supports __fp16. > > >> >> jl_value_t *ret = jl_eval_string(code_string); >> jl_array_t *ret_array = (jl_array_t*)ret; >> >> if (jl_array_eltype(ret) == jl_float16_type) { >> >> /* now I need to convert the 'ret_array' to a C++ array of floats, but >> how do I do that when they're given in Float16? */ >> >> } >> >> >> On Tuesday, 18 October 2016 20:57:10 UTC-4, Isaiah wrote: >>> >>> The issue here is that `jl_array_eltype` is already returning a type. >>> >>> `jl_typeis(v, t)` becomes `jl_typeof(v) == t`, so your checks become: >>> >>> jl_typeof(array_type) == jl_int64_type >>> >>> But >>> >>> jl_typeof(array_type) -> DataType >>> >>> Instead, either do the equality check directly: >>> >>> array_type == jl_int64_type >>> >>> Or use the exported API only (jlapi.c): >>> >>> strcmp(jl_typename_str(array_type), jl_typename_str(jl_int64_type)) >>> >>> On Tue, Oct 18, 2016 at 7:52 PM, Kyle Kotowick <[email protected]> >>> wrote: >>> >>>> I apologize for the formatting, that should be: >>>> >>>> jl_value_t *ret = jl_eval_string(code_string); >>>> void* array_type = jl_array_eltype(ret); >>>> jl_array_t *ret_array = (jl_array_t*)ret; >>>> >>>> if (jl_typeis(array_type, jl_int64_type)) { >>>> long *data = (long*) jl_array_data(ret_array); >>>> } >>>> else if (jl_typeis(array_type, jl_float64_type)) { >>>> double *data = (double*) jl_array_data(ret_array); >>>> } >>>> >>>> >>>> And the issue is that even if it is an Int64 or Float64, neither of >>>> those IF statements will return true. >>>> >>>> >>>> >>>> On Sunday, 16 October 2016 21:36:03 UTC-4, Kyle Kotowick wrote: >>>>> >>>>> Awesome, thanks. Could you show how to use it in a minimal code >>>>> example? Here's what I'm currently trying, but it does not appear to be >>>>> working: >>>>> >>>>> jl_value_t *ret = jl_eval_string(code_string); >>>>> void* array_type = jl_array_eltype(ret); >>>>> jl_array_t *ret_array = (jl_array_t*)ret; >>>>> >>>>> >>>>> >>>>> if (jl_typeis(array_type, jl_int64_type)) { >>>>> long *data = (long*) jl_array_data(ret_array); >>>>> } >>>>> else if (jl_typeis(array_type, jl_float64_type)) { double *data = ( >>>>> double*) jl_array_data(ret_array); >>>>> } >>>>> >>>>> >>>>> On Friday, 14 October 2016 20:45:18 UTC-4, Isaiah wrote: >>>>>> >>>>>> On Fri, Oct 14, 2016 at 2:28 PM, Kyle Kotowick <[email protected]> >>>>>> wrote: >>>>>>> >>>>>>> >>>>>>> After determining that an array was returned, how would you >>>>>>> determine what the inner type of the array is (i.e. the type of the >>>>>>> objects >>>>>>> it contains)? >>>>>>> >>>>>> >>>>>> `jl_array_eltype` >>>>>> >>>>>> >>>>>>> >>>>>>> And furthermore, if it returns an array of type "Any", would there >>>>>>> be any way to tell what the type is of any arbitrary element in that >>>>>>> array? >>>>>>> >>>>>> >>>>>> `jl_typeof`, after retrieving the element (which will be boxed) >>>>>> >>>>>> >>>>>>> >>>>>>> Thanks! >>>>>>> >>>>>> >>>>>> >>> >
