feat: create alias for default FixedRational type

Author: MilesCranmer

src/DynamicQuantities.jl

@@ -3,7 +3,7 @@ module DynamicQuantities
 export Units, Constants, SymbolicUnits, SymbolicConstants
 export AbstractQuantity, AbstractGenericQuantity, AbstractRealQuantity, UnionAbstractQuantity
 export Quantity, GenericQuantity, RealQuantity
-export FixedRational
+export FixedRational, FRInt32, FRInt8
 export AbstractDimensions, Dimensions, NoDims
 export AbstractSymbolicDimensions, SymbolicDimensions, SymbolicDimensionsSingleton
 export QuantityArray

src/types.jl

@@ -4,7 +4,21 @@ else
     @eval const static_fieldnames = fieldnames
 end
 
-const DEFAULT_DIM_BASE_TYPE = FixedRational{DEFAULT_NUMERATOR_TYPE,DEFAULT_DENOM}
+"""
+    FRInt32
+
+FixedRational with Int32 numerator and denominator 25200.
+"""
+const FRInt32 = FixedRational{DEFAULT_NUMERATOR_TYPE,DEFAULT_DENOM}
+
+"""
+    FRInt8
+
+FixedRational with Int8 numerator and denominator 12.
+"""
+const FRInt8 = FixedRational{Int8, 12}
+
+const DEFAULT_DIM_BASE_TYPE = FRInt32
 const DEFAULT_VALUE_TYPE = Float64
 
 """

test/unittests.jl

@@ -737,6 +737,15 @@ end
     x = 10u"m"
     user_quantity = Quantity(10.0, Dimensions{FixedRational{Int32,25200}}(1, 0, 0, 0, 0, 0, 0))
     @test x == user_quantity
+
+    @testset "FRInt32 and FRInt8 type aliases" begin
+        @test FRInt32 === FixedRational{Int32, 25200}
+        @test FRInt8 === FixedRational{Int8, 12}
+        @test DEFAULT_DIM_BASE_TYPE === FRInt32
+
+        @test string(FRInt32) == "FRInt32"
+        @test string(FRInt8) == "FRInt8"
+    end
 end
 
 @testset "Quantity promotion" begin