add func for getting numerator & denominator

JuliaMath · Jun 28, 2020 · b72a32b · b72a32b
1 parent e8c9f3b
commit b72a32b
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diff --git a/src/FixedPointDecimals.jl b/src/FixedPointDecimals.jl
@@ -325,6 +325,13 @@ function Base.convert(::Type{TR}, x::FD{T, f}) where {TR <: Rational, T, f}
     convert(TR, x.i // coefficient(FD{T, f}))::TR
 end
 
+function Base.numerator(x::FixedDecimal{T,f})::T where {T, f}
+    return convert(Rational, x).num
+end
+function Base.denominator(x::FixedDecimal{T,f})::T where {T, f}
+    return convert(Rational, x).den
+end
+
 (::Type{T})(x::FD) where {T<:Union{AbstractFloat,Integer,Rational}} = convert(T, x)
 
 Base.promote_rule(::Type{FD{T, f}}, ::Type{<:Integer}) where {T, f} = FD{T, f}

diff --git a/test/runtests.jl b/test/runtests.jl
@@ -176,6 +176,12 @@ end
         @test convert(Rational, fd) == 1//4
     end
 
+    @testset "get numerator and denominator" begin
+        fd = reinterpret(FD2, 25)
+        @test denominator(fd) == 4
+        @test numerator(fd) == 1
+    end
+
     @testset "invalid" begin
         @test_throws InexactError convert(FD2, FD4(0.0001))
         @test_throws InexactError convert(FD4, typemax(FD2))