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Use one-arg op form for reduce_first (Alternative #58490) #58491

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Use one-arg op form for reduce_first (Alternative #58490) #58491

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15 changes: 3 additions & 12 deletions base/reduce.jl
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,7 @@ add_sum(x, y) = x + y
add_sum(x::BitSignedSmall, y::BitSignedSmall) = Int(x) + Int(y)
add_sum(x::BitUnsignedSmall, y::BitUnsignedSmall) = UInt(x) + UInt(y)
add_sum(x::Real, y::Real)::Real = x + y
add_sum(x) = +(x)

"""
Base.mul_prod(x, y)
Expand All @@ -28,6 +29,7 @@ mul_prod(x, y) = x * y
mul_prod(x::BitSignedSmall, y::BitSignedSmall) = Int(x) * Int(y)
mul_prod(x::BitUnsignedSmall, y::BitUnsignedSmall) = UInt(x) * UInt(y)
mul_prod(x::Real, y::Real)::Real = x * y
mul_prod(x) = *(x)

and_all(x, y) = (x && y)::Bool
or_any(x, y) = (x || y)::Bool
Expand Down Expand Up @@ -397,18 +399,7 @@ The default is `x` for most types. The main purpose is to ensure type stability,
additional methods should only be defined for cases where `op` gives a result with
different types than its inputs.
"""
reduce_first(op, x) = x
reduce_first(::typeof(+), x::Bool) = Int(x)
reduce_first(::typeof(*), x::AbstractChar) = string(x)

reduce_first(::typeof(add_sum), x) = reduce_first(+, x)
reduce_first(::typeof(add_sum), x::BitSignedSmall) = Int(x)
reduce_first(::typeof(add_sum), x::BitUnsignedSmall) = UInt(x)
reduce_first(::typeof(mul_prod), x) = reduce_first(*, x)
reduce_first(::typeof(mul_prod), x::BitSignedSmall) = Int(x)
reduce_first(::typeof(mul_prod), x::BitUnsignedSmall) = UInt(x)
reduce_first(::typeof(vcat), x) = vcat(x)
reduce_first(::typeof(hcat), x) = hcat(x)
reduce_first(op, x) = applicable(op, x) ? op(x) : x

"""
Base.mapreduce_first(f, op, x)
Expand Down