# Internals & Design

**URL:** https://discourse.julialang.org/c/dev/5.md?page=55

[Latest](https://discourse.julialang.org/latest.md) · [Categories](https://discourse.julialang.org/categories.md) · [Tags](https://discourse.julialang.org/tags.md)

**Page:** 56

---

## [We really need a CLI that hooks directly into Pkg](https://discourse.julialang.org/t/we-really-need-a-cli-that-hooks-directly-into-pkg/14639)

<div class="topic-metadata">

**Author:** [@ExpandingMan](https://discourse.julialang.org/u/ExpandingMan)\
**Replies:** 16\
**Last updated:** [September 7, 2018, 5:45pm UTC](https://discourse.julialang.org/t/we-really-need-a-cli-that-hooks-directly-into-pkg/14639 "2018-09-07T17:45:33Z")

</div>

Lately I’ve been looking into CI/CD with gitlab. This involves creating a bunch of setup yamls with bash commands much like in Travis. As I set these up I am always irked by having to do julia -e "import Pkg; Pkg.add(…

---

## [Help implementing new iterate interface?](https://discourse.julialang.org/t/help-implementing-new-iterate-interface/14669)

<div class="topic-metadata">

**Author:** [@crbinz](https://discourse.julialang.org/u/crbinz)\
**Replies:** 2\
**Last updated:** [September 7, 2018, 4:07pm UTC](https://discourse.julialang.org/t/help-implementing-new-iterate-interface/14669 "2018-09-07T16:07:28Z")

</div>

I’m trying to implement the new iterate interface in JLD.jl, but I can’t get it to work, mostly because I don’t quite understand the original implementation. I tried Base.iterate(parent::Union{JldFile, JldGroup}, state…

---

## [Method variable names and destructuring](https://discourse.julialang.org/t/method-variable-names-and-destructuring/14664)

<div class="topic-metadata">

**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 1\
**Last updated:** [September 7, 2018, 3:03pm UTC](https://discourse.julialang.org/t/method-variable-names-and-destructuring/14664 "2018-09-07T15:03:20Z")

</div>

I am trying to fix DocStringExtensions.jl/issues/67, for which I need to get the variable names also for destructured arguments. MWE: f((x, y), z) = x + y + z ## how to extract something like ((:x, :y), :z) ## from firs…

---

## [Pkg offerings](https://discourse.julialang.org/t/pkg-offerings/14583)

<div class="topic-metadata">

**Author:** [@iwelch](https://discourse.julialang.org/u/iwelch)\
**Replies:** 18\
**Last updated:** [September 6, 2018, 2:41pm UTC](https://discourse.julialang.org/t/pkg-offerings/14583 "2018-09-06T14:41:49Z")

</div>

may I strongly suggest that the backend repository implement a system whereby it tries each submitted package on a vanilla julia 1.0 install, and if this submitted package fails with an error at pre-compilation time to t…

---

## [Custom index arithmetic](https://discourse.julialang.org/t/custom-index-arithmetic/14374)

<div class="topic-metadata">

**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 7\
**Last updated:** [September 6, 2018, 4:48am UTC](https://discourse.julialang.org/t/custom-index-arithmetic/14374 "2018-09-06T04:48:56Z")

</div>

This is a clarifying question about custom indexing. If x::AbstractVector has a conforming interface, can I assume that that the valid indexes are firstindex(x):lastindex(x), ie they are integers (so nothing wacky li…

---

## [Not sure how \`Adjoint\` types are described](https://discourse.julialang.org/t/not-sure-how-adjoint-types-are-described/14414)

<div class="topic-metadata">

**Author:** [@dmbates](https://discourse.julialang.org/u/dmbates)\
**Replies:** 4\
**Last updated:** [September 5, 2018, 3:27pm UTC](https://discourse.julialang.org/t/not-sure-how-adjoint-types-are-described/14414 "2018-09-05T15:27:16Z")

</div>

I am upgrading the MixedModels package to Julia v1.0 in the 0.7updates branch. This package uses linear algebra operations on various types of matrix-like objects. What would previously be a method for a generic like A…

---

## [Pkg build fails needing to load dependencies](https://discourse.julialang.org/t/pkg-build-fails-needing-to-load-dependencies/14554)

<div class="topic-metadata">

**Author:** [@bill-p](https://discourse.julialang.org/u/bill-p)\
**Replies:** 2\
**Last updated:** [September 5, 2018, 2:30pm UTC](https://discourse.julialang.org/t/pkg-build-fails-needing-to-load-dependencies/14554 "2018-09-05T14:30:43Z")

</div>

I’m new to Julia, only one week experience. Tried to install the Gtk.jl package, but when I run build it finds missing dependencies, prompts for the admin password, lists the items it needs, but aborts at the system prom…

---

## [Blog in documentation?](https://discourse.julialang.org/t/blog-in-documentation/14352)

<div class="topic-metadata">

**Author:** [@DominiqueMakowski](https://discourse.julialang.org/u/DominiqueMakowski)\
**Replies:** 12\
**Last updated:** [September 1, 2018, 7:31am UTC](https://discourse.julialang.org/t/blog-in-documentation/14352 "2018-09-01T07:31:36Z")

</div>

A blog is a good way to disseminate updates, examples or particular use-cases. They can be reposted, shared and so on. That’s why many packages (for instance for R) use their GitHub page for hosting a blog, and creating …

---

## [Julia's history: array indexing](https://discourse.julialang.org/t/julias-history-array-indexing/14390)

<div class="topic-metadata">

**Author:** [@00vareladavid](https://discourse.julialang.org/u/00vareladavid)\
**Replies:** 3\
**Last updated:** [September 1, 2018, 5:21am UTC](https://discourse.julialang.org/t/julias-history-array-indexing/14390 "2018-09-01T05:21:35Z")

</div>

I just noticed that xs\[length(xs)+1+n:end\] returns an empty vector instead of throwing a bounds error. I think this is brilliant! When was this behavior introduced? I don’t think I’ve seen this behavior in other languag…

---

## [Why doesn't Julia allow multiple inheritance?](https://discourse.julialang.org/t/why-doesnt-julia-allow-multiple-inheritance/14342)

<div class="topic-metadata">

**Author:** [@lcmylin](https://discourse.julialang.org/u/lcmylin)\
**Replies:** 8\
**Last updated:** [August 31, 2018, 12:29pm UTC](https://discourse.julialang.org/t/why-doesnt-julia-allow-multiple-inheritance/14342 "2018-08-31T12:29:16Z")

</div>

To be clear, when I write “multiple inheritance” in this context, I don’t mean multiple structural inheritance (as in C++), but rather multiple abstract class inheritance. In other words, the allowance for a node in the …

---

## [Really Fast Hash Set and Map](https://discourse.julialang.org/t/really-fast-hash-set-and-map/14190)

<div class="topic-metadata">

**Author:** [@nordlow](https://discourse.julialang.org/u/nordlow)\
**Replies:** 20\
**Last updated:** [August 29, 2018, 2:48pm UTC](https://discourse.julialang.org/t/really-fast-hash-set-and-map/14190 "2018-08-29T14:48:41Z")

</div>

Does Julia have a fast generic implementation of hashed data structures, that is hash table and hash sets? Is the builtin Dict() as fast as in languages such as C++, Rust and D? Are there alternatives or examples of co…

---

## [Embedding Julia into Java](https://discourse.julialang.org/t/embedding-julia-into-java/14048)

<div class="topic-metadata">

**Author:** [@rssdev10](https://discourse.julialang.org/u/rssdev10)\
**Replies:** 2\
**Last updated:** [August 28, 2018, 11:44am UTC](https://discourse.julialang.org/t/embedding-julia-into-java/14048 "2018-08-28T11:44:48Z")

</div>

Hello, I decided to check possibility of calling Julia code from Java and prepared some draft binding library - https://github.com/rssdev10/julia4j There are some simple but workable examples. First question - how to …

---

## [Functionloc paths for the standard library](https://discourse.julialang.org/t/functionloc-paths-for-the-standard-library/14113)

<div class="topic-metadata">

**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 1\
**Last updated:** [August 27, 2018, 8:30am UTC](https://discourse.julialang.org/t/functionloc-paths-for-the-standard-library/14113 "2018-08-27T08:30:57Z")

</div>

While Base is correct, standard libraries seem to give the paths of the machine it was built in. Eg for the official 1.0 binaries, julia\> methods(Base.parent) # 9 methods for generic function "parent": \[1\] parent(V::Sub…

---

## [Install attobot on a JuliaMath repo](https://discourse.julialang.org/t/install-attobot-on-a-juliamath-repo/14068)

<div class="topic-metadata">

**Author:** [@waldyrious](https://discourse.julialang.org/u/waldyrious)\
**Replies:** 0\
**Last updated:** [August 26, 2018, 6:46am UTC](https://discourse.julialang.org/t/install-attobot-on-a-juliamath-repo/14068 "2018-08-26T06:46:27Z")

</div>

I’ve just tried to set up attobot on JuliaMath/Tau.jl, but got the following message: You do not have permission to modify this app on JuliaMath. Please contact an Organization Owner. Can someone with owner access to…

---

## [Is a more specialized element type of unique() a breaking change?](https://discourse.julialang.org/t/is-a-more-specialized-element-type-of-unique-a-breaking-change/14003)

<div class="topic-metadata">

**Author:** [@laborg](https://discourse.julialang.org/u/laborg)\
**Replies:** 3\
**Last updated:** [August 25, 2018, 7:03am UTC](https://discourse.julialang.org/t/is-a-more-specialized-element-type-of-unique-a-breaking-change/14003 "2018-08-25T07:03:12Z")

</div>

I’m working on https://github.com/JuliaLang/julia/pull/28737 to educate myself and have now come to a point where I’m wondering if a more specialized return type of the function unique would be a problem. Current behavi…

---

## [Compile-time arithmetic for parameterized types](https://discourse.julialang.org/t/compile-time-arithmetic-for-parameterized-types/13991)

<div class="topic-metadata">

**Author:** [@e3c6](https://discourse.julialang.org/u/e3c6)\
**Replies:** 1\
**Last updated:** [August 24, 2018, 12:36pm UTC](https://discourse.julialang.org/t/compile-time-arithmetic-for-parameterized-types/13991 "2018-08-24T12:36:44Z")

</div>

I want to define type like this: struct A{L} x::NTuple{L,Int}; y::NTuple{L^2,Int} end Here L is known at compile-time. Therefore L^2 could also be known at compile-time in principle. But the example above is a syntax…

---

## [Proposal: Add to Julia a macro to make operations between elements of structures easier](https://discourse.julialang.org/t/proposal-add-to-julia-a-macro-to-make-operations-between-elements-of-structures-easier/13837)

<div class="topic-metadata">

**Author:** [@Ronis\_BR](https://discourse.julialang.org/u/Ronis_BR)\
**Replies:** 13\
**Last updated:** [August 21, 2018, 8:45pm UTC](https://discourse.julialang.org/t/proposal-add-to-julia-a-macro-to-make-operations-between-elements-of-structures-easier/13837 "2018-08-21T20:45:13Z")

</div>

Hi guys, I would like to propose a macro to be added to Julia to make the operations between elements of structures easier. For example, let’s say you have a structure with lots of fields called Configurations. Like: s…

---

## [Removal of workspace() and a way to clear variables](https://discourse.julialang.org/t/removal-of-workspace-and-a-way-to-clear-variables/11107)

<div class="topic-metadata">

**Author:** [@digital\_carver](https://discourse.julialang.org/u/digital_carver)\
**Replies:** 12\
**Last updated:** [August 21, 2018, 5:41pm UTC](https://discourse.julialang.org/t/removal-of-workspace-and-a-way-to-clear-variables/11107 "2018-08-21T17:41:41Z")

</div>

The removal of workspace() is a major change that seems to have been done without much discussion (Rationale for the removal of workspace()?, 25046, 10351, 22434). The suggested replacement, Revise.jl, might be good for…

---

## [New Pkg: Immediate Compile and Version Variable?](https://discourse.julialang.org/t/new-pkg-immediate-compile-and-version-variable/13255)

<div class="topic-metadata">

**Author:** [@iwelch](https://discourse.julialang.org/u/iwelch)\
**Replies:** 10\
**Last updated:** [August 21, 2018, 5:22pm UTC](https://discourse.julialang.org/t/new-pkg-immediate-compile-and-version-variable/13255 "2018-08-21T17:22:46Z")

</div>

I am beginning to use Julia 1.0. Pkg.dir() no longer seems to work (and has no docs). What has replaced it? Pkg.status() works differently. Alas, these are just minor questions. I have a reason for posting to develo…

---

## [Testing GC and finalizers](https://discourse.julialang.org/t/testing-gc-and-finalizers/13814)

<div class="topic-metadata">

**Author:** [@lobingera](https://discourse.julialang.org/u/lobingera)\
**Replies:** 2\
**Last updated:** [August 21, 2018, 10:11am UTC](https://discourse.julialang.org/t/testing-gc-and-finalizers/13814 "2018-08-21T10:11:36Z")

</div>

a) How is GC tested in Julia (read as: method)? b) Where could i find test code (read as: where in the julia repo)? c) Are there known tests for finalizers somewhere in packages?

---

## [Pkg vs. shell REPL-mode](https://discourse.julialang.org/t/pkg-vs-shell-repl-mode/12688)

<div class="topic-metadata">

**Author:** [@airpmb](https://discourse.julialang.org/u/airpmb)\
**Replies:** 3\
**Last updated:** [August 20, 2018, 6:36pm UTC](https://discourse.julialang.org/t/pkg-vs-shell-repl-mode/12688 "2018-08-20T18:36:51Z")

</div>

I just noticed how the Pkg REPL-mode is “sticky” in the sense that after issuing a command in it you remain in Pkg mode, while the shell REPL-mode is not. I’m curious if the inconsistency is deliberate, and if so what th…

---

## [Big overhead with the new lazy reshape/reinterpret](https://discourse.julialang.org/t/big-overhead-with-the-new-lazy-reshape-reinterpret/7635)

<div class="topic-metadata">

**Author:** [@pablosanjose](https://discourse.julialang.org/u/pablosanjose)\
**Replies:** 35\
**Last updated:** [August 18, 2018, 9:02pm UTC](https://discourse.julialang.org/t/big-overhead-with-the-new-lazy-reshape-reinterpret/7635 "2018-08-18T21:02:19Z")

</div>

I’m finding important performance regressions when indexing into the new reshape/reinterpret wrappers. (This is causing problems in trying to update NearestNeighbors.jl) Current v0.7 master julia\> using StaticArrays ju…

---

## [Should modules no longer use \_\_precompile\_\_()?](https://discourse.julialang.org/t/should-modules-no-longer-use-precompile/13660)

<div class="topic-metadata">

**Author:** [@galenlynch](https://discourse.julialang.org/u/galenlynch)\
**Replies:** 2\
**Last updated:** [August 18, 2018, 2:17pm UTC](https://discourse.julialang.org/t/should-modules-no-longer-use-precompile/13660 "2018-08-18T14:17:45Z")

</div>

Reading the docs for 0.7, only \_\_precompile\_\_(false) is mentioned. It seems like modules are now precompiled be default, so is putting a \_\_precompile\_\_() statement at the top of a module still recommended?

---

## [problems building julia 0.7 on Linux](https://discourse.julialang.org/t/problems-building-julia-0-7-on-linux/12221)

<div class="topic-metadata">

**Author:** [@mywrathacademia](https://discourse.julialang.org/u/mywrathacademia)\
**Replies:** 3\
**Last updated:** [August 16, 2018, 12:31pm UTC](https://discourse.julialang.org/t/problems-building-julia-0-7-on-linux/12221 "2018-08-16T12:31:41Z")

</div>

When I run make testall it fails at the cmdlineargs test. I have uninstalled julia and set FFLAGS=-ff2c but it still fails. My versioninfo() is: Julia Version 0.7.0-beta.182 Commit feaee9ebbc (2018-07-06 12:39 UTC) Plat…

---

## [Build Julia with Cygwin64 on Windows 10, julia-debug.exe is missing?](https://discourse.julialang.org/t/build-julia-with-cygwin64-on-windows-10-julia-debug-exe-is-missing/13545)

<div class="topic-metadata">

**Author:** [@xiucai](https://discourse.julialang.org/u/xiucai)\
**Replies:** 2\
**Last updated:** [August 16, 2018, 10:34am UTC](https://discourse.julialang.org/t/build-julia-with-cygwin64-on-windows-10-julia-debug-exe-is-missing/13545 "2018-08-16T10:34:17Z")

</div>

follow README.windows, on my magicbook (Intel Core i7-8550U), after almost 5 hours at least, done, BLAS and SuiteSparse cost most of time. but only julia.exe under usr/bin, where is juila-debug.exe? instructions are be…

---

## [How to update badges on GitHub for different project](https://discourse.julialang.org/t/how-to-update-badges-on-github-for-different-project/13132)

<div class="topic-metadata">

**Author:** [@affans](https://discourse.julialang.org/u/affans)\
**Replies:** 2\
**Last updated:** [August 15, 2018, 7:02pm UTC](https://discourse.julialang.org/t/how-to-update-badges-on-github-for-different-project/13132 "2018-08-15T19:02:06Z")

</div>

I basically had to go through my projects using statements and see if packages were updated for 0.7/1.0 by looking at commits and activity. I noticed that for some packages, there are certain “badges” that tell you the …

---

## [Where is OldPkg](https://discourse.julialang.org/t/where-is-oldpkg/13482)

<div class="topic-metadata">

**Author:** [@galenlynch](https://discourse.julialang.org/u/galenlynch)\
**Replies:** 2\
**Last updated:** [August 15, 2018, 2:08pm UTC](https://discourse.julialang.org/t/where-is-oldpkg/13482 "2018-08-15T14:08:50Z")

</div>

And/or what is its uuid? I see lots of traces of it being move around the internet but it’s not in stdlibs after I build and I can’t seem to find its repo or uuid.

---

## [Request For Help: BinaryBuilder for Gtk and Cairo](https://discourse.julialang.org/t/request-for-help-binarybuilder-for-gtk-and-cairo/13418)

<div class="topic-metadata">

**Author:** [@tobias.knopp](https://discourse.julialang.org/u/tobias.knopp)\
**Replies:** 13\
**Last updated:** [August 15, 2018, 11:59am UTC](https://discourse.julialang.org/t/request-for-help-binarybuilder-for-gtk-and-cairo/13418 "2018-08-15T11:59:41Z")

</div>

This is a request for help. Might there somebody interested in helping to provide a BinaryBuilder for Gtk and Cairo? Regularly I would say lets better solve the Homebrew issues on Mac but it seems to me that BinaryBuilde…

---

## [Problems running Pkg.test with Pkg3 on v0.7.0-alpha](https://discourse.julialang.org/t/problems-running-pkg-test-with-pkg3-on-v0-7-0-alpha/11497)

<div class="topic-metadata">

**Author:** [@ScottPJones](https://discourse.julialang.org/u/ScottPJones)\
**Replies:** 2\
**Last updated:** [August 15, 2018, 8:24am UTC](https://discourse.julialang.org/t/problems-running-pkg-test-with-pkg3-on-v0-7-0-alpha/11497 "2018-08-15T08:24:06Z")

</div>

Starting from a a freshly build v0.7.0-alpha out of master, in a directory with no Project.toml or Manifest.toml, and with ~/.julia emptied, doing the following: \]add https://github.com/JuliaString/Strs.jl#master then te…

---

## [Pkg3 "General" registry: dependencies in stdlib](https://discourse.julialang.org/t/pkg3-general-registry-dependencies-in-stdlib/13442)

<div class="topic-metadata">

**Author:** [@galenlynch](https://discourse.julialang.org/u/galenlynch)\
**Replies:** 4\
**Last updated:** [August 14, 2018, 7:31pm UTC](https://discourse.julialang.org/t/pkg3-general-registry-dependencies-in-stdlib/13442 "2018-08-14T19:31:57Z")

</div>

I noticed that the “General” registry has added dependencies to my package, which are the packages in the standard library that my project uses but I forgot to add to my REQUIRE in METADATA. I’m curious, how was this det…

[Previous page](https://discourse.julialang.org/c/dev/5.md?page=54)

[Next page](https://discourse.julialang.org/c/dev/5.md?page=56)