ANN: RoundingIntegers.jl

package
numbers

#1

I’d like to announce the RoundingIntegers, a tiny package that adds new Integer types. Very simply, RoundingIntegers always round when you assign to them. For example:

julia> Int(7.2)     # fails with "regular" integers
ERROR: InexactError()
 in Int64(::Float64) at ./sysimg.jl:53

julia> RInt(7.2)    # but not with a rounding integer
7

I suspect their main usage is in containers, e.g., Vector{RInt} would allow you to assign floating-point values that then automatically get rounded. My motivation for adding this was that I had written specialized logic for this kind of operation:

safe_setindex!{T<:Integer}(a::AbstractArray{T}, x::Real, inds...) = a[inds...] = round(T, x)
safe_setindex!(a::AbstractArray, x::Real, inds...) = a[inds...] = x

one too many times. It just seems cleaner to encode it in the type (it lets the user decided whether s/he wants an error or no error for this kind of operation).