> 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
