Created
January 12, 2020 02:16
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Got from Mason Protter
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# by Mason Protter | |
using MacroTools: MacroTools, splitdef, combinedef, @capture | |
macro specialize_vararg(n::Int, fdef) | |
d = splitdef(fdef) | |
args = d[:args][end] | |
@assert d[:args][end] isa Expr && d[:args][end].head == Symbol("...") | |
args_symbol = d[:args][end].args[] | |
fdefs = Expr(:block) | |
for i in 1:n-1 | |
di = deepcopy(d) | |
pop!(di[:args]) | |
args = Tuple(gensym("arg$j") for j in 1:i) | |
push!(di[:args], args...) | |
pushfirst!(di[:body].args, :($args_symbol = $args)) | |
push!(fdefs.args, combinedef(di)) | |
end | |
di = deepcopy(d) | |
pop!(di[:args]) | |
args = tuple((gensym() for j in 1:n)..., :($(gensym("args"))...)) | |
push!(di[:args], args...) | |
pushfirst!(di[:body].args, :($args_symbol = $(Expr(:tuple, args...)))) | |
push!(fdefs.args, combinedef(di)) | |
esc(fdefs) | |
end |
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