Skip to content

[WIP] Support for non-concrete types in promote_rule(::Type{<:FixedPoint}, ::Type{<:FixedPoint}) #341

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Draft
kimikage wants to merge 1 commit into
base: master
Choose a base branch
from
Draft

[WIP] Support for non-concrete types in promote_rule(::Type{<:FixedPoint}, ::Type{<:FixedPoint}) #341

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
9 changes: 5 additions & 4 deletions src/FixedPointNumbers.jl
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -49,7 +49,8 @@ reinterpret(::Type{X}, x::T) where {T <: Integer, X <: FixedPoint{T}} = X(x, 0)

# static parameters
nbitsfrac(::Type{X}) where {T, f, X <: FixedPoint{T,f}} = f
rawtype(::Type{X}) where {T, X <: FixedPoint{T}} = T
rawtype(::Type{X}) where {T <: Integer, X <: FixedPoint{T}} = T
rawtype(::Type{<:FixedPoint}) = Union{} # Don't care the constraints for `T`

# traits based on static parameters
signbits(::Type{X}) where {T, X <: FixedPoint{T}} = T <: Unsigned ? 0 : 1
Expand Down Expand Up @@ -539,15 +540,15 @@ promote_rule(::Type{X}, ::Type{Tr}) where {X <: FixedPoint, Tr <: Rational} = Tr
promote_rule(::Type{X}, ::Type{Ti}) where {X <: FixedPoint, Ti <: Integer} = floattype(X)

function promote_rule(::Type{X1}, ::Type{X2}) where {X1 <: FixedPoint, X2 <: FixedPoint}
(isconcretetype(X1) && isconcretetype(X2)) || return Union{}
X1w, X2w = wrapper(X1), wrapper(X2)
if X1w !== X2w
# X1w <: X2w && return X2w # for non-concrete types
# X2w <: X1w && return X1w # for non-concrete types
X1w <: X2w && return X2w
X2w <: X1w && return X1w
return promote_type(floattype(X1), floattype(X2))
end
X = X1w
T1, T2 = rawtype(X1), rawtype(X2)
isconcretetype(T1) && isconcretetype(T2) || return X{promote_type(T1, T2)}
f1, f2 = nbitsfrac(X1), nbitsfrac(X2)
f = max(f1, f2) # ensure we have enough precision
Tp = promote_type(T1, T2)
Expand Down
12 changes: 11 additions & 1 deletion test/traits.jl
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,5 +1,5 @@
using FixedPointNumbers, Test
using FixedPointNumbers: bitwidth
using FixedPointNumbers: bitwidth, rawtype

struct MyReal <: Real end

Expand All @@ -18,3 +18,13 @@ struct MyReal <: Real end

@test_skip(@test_throws MethodError floattype(MyReal)) # TODO: eliminate `@test_skipped` when depwarn is eliminated. See #177.
end

@testset "rawtype" begin
@test rawtype(FixedPoint) === Union{}
@test rawtype(Normed) === Union{}
@test rawtype(Fixed) === Union{}
@test rawtype(Normed{<:Unsigned}) === Union{}
@test rawtype(Fixed{Union{Int8, Int16}}) === Union{Int8, Int16}
@test rawtype(N0f8) === UInt8
@test rawtype(Q0f7) === Int8
end
Loading