From 8c173c8e514230b3597268129d466a1133a3eab8 Mon Sep 17 00:00:00 2001
From: Brendan Zabarauskas <bjzaba@yahoo.com.au>
Date: Tue, 3 Sep 2013 15:43:27 +1000
Subject: [PATCH] Impl Neg operator trait for vectors and matricies

---
 src/cgmath/matrix.rs | 10 ++++++++++
 src/cgmath/vector.rs |  6 +++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/cgmath/matrix.rs b/src/cgmath/matrix.rs
index efb1ee2..7dd76a5 100644
--- a/src/cgmath/matrix.rs
+++ b/src/cgmath/matrix.rs
@@ -135,6 +135,7 @@ pub trait Matrix
     V: Clone + Vector<S, VSlice> + Array<S, VSlice>, VSlice
 >
 :   Array<V, Slice>
++   Neg<Self>
 {
     #[inline]
     fn c<'a>(&'a self, c: uint) -> &'a V { self.i(c) }
@@ -173,6 +174,11 @@ pub trait Matrix
         *self.mut_cr(cb, rb) = tmp;
     }
 
+    #[inline]
+    fn neg_self(&mut self) {
+        for c in self.mut_iter() { *c = c.neg() }
+    }
+
     // fn swap_cr(&mut self, (ca, ra): (uint, uint), (cb, rb): (uint, uint)) {
     //     let tmp = self.cr(ca, ra).clone();
     //     *self.mut_cr(ca, ra) = self.cr(cb, rb).clone();
@@ -201,6 +207,10 @@ pub trait Matrix
     // pub fn is_symmetric(&self) -> bool;
 }
 
+impl<S: Clone + Num> Neg<Mat2<S>> for Mat2<S> { #[inline] fn neg(&self) -> Mat2<S> { self.map(|c| c.neg()) } }
+impl<S: Clone + Num> Neg<Mat3<S>> for Mat3<S> { #[inline] fn neg(&self) -> Mat3<S> { self.map(|c| c.neg()) } }
+impl<S: Clone + Num> Neg<Mat4<S>> for Mat4<S> { #[inline] fn neg(&self) -> Mat4<S> { self.map(|c| c.neg()) } }
+
 impl<S: Clone + Num + ApproxEq<S>>
 Matrix<S, [Vec2<S>, ..2], Vec2<S>, [S, ..2]>
 for Mat2<S>
diff --git a/src/cgmath/vector.rs b/src/cgmath/vector.rs
index fcf5efe..ac69fdb 100644
--- a/src/cgmath/vector.rs
+++ b/src/cgmath/vector.rs
@@ -61,8 +61,8 @@ pub trait Vector
     Slice
 >
 :   Array<S, Slice>
++   Neg<Self>
 {
-    #[inline] fn neg(&self) -> Self { self.map(|x| x.neg()) }
     #[inline] fn neg_self(&mut self) { for x in self.mut_iter() { *x = x.neg()   } }
 
     #[inline] fn add_s(&self, s: S) -> Self { self.map(|x| x.add(&s)) }
@@ -100,6 +100,10 @@ pub trait Vector
     }
 }
 
+impl<S: Clone + Num> Neg<Vec2<S>> for Vec2<S> { #[inline] fn neg(&self) -> Vec2<S> { self.map(|x| x.neg()) } }
+impl<S: Clone + Num> Neg<Vec3<S>> for Vec3<S> { #[inline] fn neg(&self) -> Vec3<S> { self.map(|x| x.neg()) } }
+impl<S: Clone + Num> Neg<Vec4<S>> for Vec4<S> { #[inline] fn neg(&self) -> Vec4<S> { self.map(|x| x.neg()) } }
+
 impl<S: Clone + Num> Vector<S, [S, ..2]> for Vec2<S>;
 impl<S: Clone + Num> Vector<S, [S, ..3]> for Vec3<S>;
 impl<S: Clone + Num> Vector<S, [S, ..4]> for Vec4<S>;