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Redefinable structures

License: MIT License

Julia 100.00%

julia metaprogramming struct redefine reload code-reload

redefstructs.jl's Introduction

RedefStructs.jl

This package provides the macro @redef, which allows to create structures which are redefinable.

Example

julia> using RedefStructs

julia> @redef struct S
           s::String
       end

julia> S("Hello").s
"Hello"

julia> @redef mutable struct S
           n::Int
       end

julia> S(42).n
42

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redefstructs.jl's Issues

`name` field of `TypeName` is const on 1.8

Just a heads up of a change in the internals in Julia for 1.8 that causes a breakage of this package:

valid: Error During Test at /home/pkgeval/.julia/packages/RedefStructs/JMYNd/test/runtests.jl:7
  Test threw exception
  Expression: begin
    #= /home/pkgeval/.julia/packages/RedefStructs/JMYNd/test/runtests.jl:7 =# @redef struct S
        end
    true
end
  setfield!: const field .name of type TypeName cannot be changed
  Stacktrace:
   [1] setproperty!(x::Core.TypeName, f::Symbol, v::Symbol)
     @ Base ./Base.jl:39
   [2] macro expansion
     @ ~/.julia/packages/RedefStructs/JMYNd/src/RedefStructs.jl:45 [inlined]
   [3] macro expansion
     @ /opt/julia/share/julia/stdlib/v1.8/Test/src/Test.jl:464 [inlined]
   [4] macro expansion
     @ ~/.julia/packages/RedefStructs/JMYNd/test/runtests.jl:7 [inlined]
   [5] macro expansion

PkgEval log: https://s3.amazonaws.com/julialang-reports/nanosoldier/pkgeval/by_hash/f51f24c_vs_2ca8b0c/RedefStructs.primary.log

`@redef_print` doesn't work with parametric types

julia> using RedefStructs

julia> @redef_print struct S{T}
           x::T
       end
ERROR: ArgumentError: method definition for show_datatype at /home/fstra/.julia/dev/RedefStructs/src/RedefStructs.jl:88 has free type variables
Stacktrace:
 [1] top-level scope
   @ ~/.julia/dev/RedefStructs/src/RedefStructs.jl:91

TagBot trigger issue

This issue is used to trigger TagBot; feel free to unsubscribe.

If you haven't already, you should update your TagBot.yml to include issue comment triggers.
Please see this post on Discourse for instructions and more details.

If you'd like for me to do this for you, comment TagBot fix on this issue.
I'll open a PR within a few hours, please be patient!

Add `@kwredef` macro

See https://discourse.julialang.org/t/advice-for-dealing-with-struct-during-development/21732/15 for an explanation.

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