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[wpiunits] Change units to track their base unit, instead of their base class (#6342)

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Unit objects now have a reference to the base unit from which they're derived. Constructing a unit object without specifying a base unit implicitly signifies that it's its own base unit, eg new Angle(null, 1, "Radian", "rad") would be the base angle unit of radians, while new Angle(Radians, 2 * PI, "Rotation", "R") would be a new angle unit based on radians.

This fixes much of the hacky code surrounding the derived unit types Velocity, Per, and Mult, but is a breaking change for any user code that defines custom unit classes or uses the anonymous unit type.
This commit is contained in:
Sam Carlberg
2024-05-12 09:15:56 -04:00
committed by GitHub
parent dc00a13d83
commit 6c9dcc157e
23 changed files with 312 additions and 162 deletions
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11
wpiunits/src/test/java/edu/wpi/first/units/ExampleUnit.java
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@@ -9,11 +9,16 @@ class ExampleUnit extends Unit<ExampleUnit> {
this(baseUnitEquivalent, "Example", "ex");
}
ExampleUnit(UnaryFunction toBase, UnaryFunction fromBase, String name, String symbol) {
super(ExampleUnit.class, toBase, fromBase, name, symbol);
ExampleUnit(
ExampleUnit baseUnit,
UnaryFunction toBase,
UnaryFunction fromBase,
String name,
String symbol) {
super(baseUnit, toBase, fromBase, name, symbol);
}
ExampleUnit(double baseUnitEquivalent, String name, String symbol) {
super(ExampleUnit.class, baseUnitEquivalent, name, symbol);
super(null, baseUnitEquivalent, name, symbol);
}
}