possibly read/write functions? about jld.jl HOT 2 CLOSED

This is probably possible to pull off, but will definitely take some exploration. A PR would be welcome 😄. You may find some good tips about manipulating the AST in FastAnonymous.jl.

from jld.jl.

I'm new to Julia, but after digging around in reflection.jl, it appears that it's possible to store the lowered ASTs of functions as expressions, save the expressions in JLD, and then eval the expressions after loading from the JLD file to recover the original functions:

using JLD

function func2expr(fun::Function)
    @assert !isa(fun.env, MethodTable) "function should be anonymous"
    ast = Base.uncompressed_ast(fun.code)
    Expr(:function, Expr(:tuple, ast.args[1]...), Expr(:block, ast.args[3].args...))
end

f = x -> 2x
ast_expr = func2expr(f)

@save "function.jld" ast_expr

@load "function.jld"
f_copy = eval(ast_expr)

This email thread covers a very similar issue and is helpful in understanding ASTs: https://groups.google.com/forum/#!topic/julia-users/SlCTBKOxzuU.

I am not acquainted with the JLD code, but it seems within the scope of the project to have JLD do this automatically.

from jld.jl.