Read through the julia-dev thread I linked to – this is addressed in depth there.
On Tue, Mar 22, 2016 at 12:55 PM, Mauro <mauro...@runbox.com> wrote: > > By the way isn't type Basic in my code a composite type? > > Basic is defined both as `type` and as `abstract` which will error. > > > So is there any way of inheritance among composite types ? > > No. > > > Also is there any libraries which I can refer to which uses extensive > > inheritance? > > > > In C++ we can easily inherit classes ? Why don't we have such ease in > Julia ? > > Because Julia is designed this way. Because with the ease also comes pain. > > > On Tuesday, March 22, 2016 at 9:20:19 PM UTC+5:30, Stefan Karpinski > wrote: > > > > Have a read on this oldish thread: > https://groups.google.com/forum/#!topic/ > > julia-dev/eA4VkFAD-yQ. Still applies today. > > > > On Tue, Mar 22, 2016 at 11:30 AM, kunal singh <ks25...@gmail.com> > wrote: > > > > > > > > On Tuesday, March 22, 2016 at 8:43:50 PM UTC+5:30, Mauro wrote: > > > > > Hi Mauro , > > > > > > Can you show me any example ? > > > I am a beginner in Julia. It would of great help for me. > > > > In Julia the number types are defined here: > > https://github.com/JuliaLang/julia/blob/ > > fdbcdf78bf0106e609a8d83b9e896d2d11bae594/base/boot.jl#L156 > > > > So there are the abstract types: > > > > abstract Number > > abstract Real <: Number > > abstract AbstractFloat <: Real > > abstract Integer <: Real > > abstract Signed <: Integer > > abstract Unsigned <: Integer > > > > and then there are concrete subtypes. For example a few > integer > > types: > > > > bitstype 8 Bool <: Integer > > bitstype 64 Int64 <: Signed > > bitstype 64 UInt64 <: Unsigned > > > > > > > On Tuesday, March 22, 2016 at 8:01:47 PM UTC+5:30, Mauro > wrote: > > > > > > You can only inherit from abstract types. Also, first > > defining > > > > > > type number > > > ... > > > end > > > > > > and then > > > > > > abstract number > > > > > > is not possible. It cannot be both abstract and concrete. > > (Also note > > > that types are by convention Captialized). > > > > > > So build your hierarchy only with abstract types and make > > concrete types > > > of some of the abstract ones. > > > > Can you explain this point please ? > > > On Tue, 2016-03-22 at 15:26, kunal singh < > ks25...@gmail.com> > > wrote: > > > > So basically there is a type called Basic defined as > > follows > > > > > > > > type Basic > > > > ptr::Ptr{Void} > > > > function Basic() > > > > z = new(C_NULL) > > > > ccall((:basic_new_stack, :libsymengine), Void, (Ptr > > {Basic}, ), &z) > > > > finalizer(z, basic_free) > > > > return z > > > > end > > > > end > > > > > > > > Now I want to create a hierarchy: integer(not Integer)< > > number(not > > > Number) < > > > > Basic > > > > > > > > But in Julia, we cannot inherit from concrete type So > what > > should I Do?? > > > > > > > > Here's My approach > > > > > > > > abstract Basic > > > > > > > > type number <: Basic > > > > ptr::Ptr{Void} > > > > function number() > > > > z = new(C_NULL) > > > > ccall((:basic_new_stack, :libsymengine), Void, (Ptr > > {Basic}, ), &z) > > > > finalizer(z, basic_free) > > > > return z > > > > end > > > > end > > > > > > > > abstract number > > > > > > > > type integer <: number > > > > ptr::Ptr{Void} > > > > function integer() > > > > z = new(C_NULL) > > > > ccall((:basic_new_stack, :libsymengine), Void, (Ptr > > {Basic}, ), &z) > > > > finalizer(z, basic_free) > > > > return z > > > > end > > > > end > > > > > > > > > > > > Please tell me if I am wrong ? > > > > Need help from >
