finished custom_ord monstrosity

src/custom_ord_wrapper.rs

@@ -0,0 +1,70 @@
+/*
+Copyright 2022 James Forster
+
+This file is part of range_bounds_map.
+
+range_bounds_map is free software: you can redistribute it and/or
+modify it under the terms of the GNU Affero General Public License as
+published by the Free Software Foundation, either version 3 of the
+License, or (at your option) any later version.
+
+range_bounds_map is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Affero General Public License for more details.
+
+You should have received a copy of the GNU Affero General Public License
+along with range_bounds_map. If not, see <https://www.gnu.org/licenses/>.
+*/
+
+use std::cmp::Ordering;
+
+pub trait CustomOrd<T> {
+	fn cmp(&self, a: &T) -> Ordering;
+}
+
+pub enum CustomOrdWrapper<C, T> {
+	CustomOrd(C),
+	Value(T),
+}
+
+impl<C, T> Ord for CustomOrdWrapper<C, T>
+where
+	C: CustomOrd<T>,
+{
+	fn cmp(&self, other: &Self) -> Ordering {
+		match (self, other) {
+			(
+				CustomOrdWrapper::CustomOrd(custom_ord),
+				CustomOrdWrapper::Value(value),
+			) => custom_ord.cmp(value),
+			(
+				CustomOrdWrapper::Value(value),
+				CustomOrdWrapper::CustomOrd(custom_ord),
+			) => custom_ord.cmp(value),
+			_ => panic!(
+				"You must have exactly ONE Value and ONE CustomOrd when comparing CustomOrdWrapper's"
+			),
+		}
+	}
+}
+
+impl<C, T> PartialOrd for CustomOrdWrapper<C, T>
+where
+	C: CustomOrd<T>,
+{
+	fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+		Some(self.cmp(other))
+	}
+}
+
+impl<C, T> Eq for CustomOrdWrapper<C, T> where C: CustomOrd<T> {}
+
+impl<C, T> PartialEq for CustomOrdWrapper<C, T>
+where
+	C: CustomOrd<T>,
+{
+	fn eq(&self, other: &Self) -> bool {
+		self.cmp(other).is_eq()
+	}
+}

src/lib.rs

@@ -226,6 +226,7 @@ along with range_bounds_map. If not, see <https://www.gnu.org/licenses/>.
 #![allow(clippy::tabs_in_doc_comments)]
 #![allow(clippy::needless_return)]
 pub(crate) mod bound_ord;
+pub(crate) mod custom_ord_wrapper;
 pub mod range_bounds_map;
 pub mod range_bounds_set;
 pub mod try_from_bounds;