FixedPointDecimals.jl
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JuliaMath
Julia fixed-point decimals built from integers
FixedPointDecimals.jl should probably implement `Base.big(::FixedDecimal)` and `Base.big(::Type{
Operations like `*` or `\` can be lossy because they can cause the number of fractional digits to exceed the precision of the FD type, e.g.: ```julia julia> FixedDecimal{Int,2}(1.11) *...
Consider: ```julia julia> @which FD{BigInt,2}(2) + 2 +(x::Number, y::Number) @ Base promotion.jl:410 julia> @code_typed FD{BigInt,2}(2) + 2 CodeInfo( 1 ─ %1 = invoke Base.GMP.MPZ.set_si(10::Int64)::BigInt │ %2 = invoke Base.GMP.bigint_pow(%1::BigInt, 2::Int64)::BigInt...
It seems you always need to specify how many decimals, e.g. with FixedDecimal{Int8, 2} and that type which is far from optional. Most likely it's not useful enough for money,...
Code to test, using Julia 1.6.6 and FixedPointDecimals 0.4.0: ``` julia> using FixedPointDecimals julia> tryparse(FixedDecimal{Int64,2},"1.5") ERROR: MethodError: no method matching tryparse(::Type{FixedDecimal{Int64, 2}}, ::String) Closest candidates are: tryparse(::Type{Complex{S}}, ::AbstractString) where S
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I'm not sure how easy this would be, but if it's at all possible, I'd be very interested in an extension of this that allows for arbitrary bases--this would have...
The default implementation of `signbit` is quite slow for `BigInt` and `Int128`. MWE: ```julia using FixedPointDecimals using BenchmarkTools signbit2(x) = signbit(x.i); x = FixedDecimal{BigInt, 10}(1); @btime signbit($x); @btime signbit2($x); x...
Had once forgotten to add the second type parameter but I was met with a stack overflow: ``` julia> FixedDecimal{Int8}(5) ERROR: StackOverflowError: Stacktrace: [1] convert(#unused#::Type{FixedDecimal{Int8}}, x::Int64) @ Base ./number.jl:7 [2]...
