Initial work on turning BitColumnMatrix32 into BitColumnMatrix<T>

Current Rust 1.45.2 doesn't support this. So need to wait until Rust is improved.
rust-lang/rust#43408

Author: cmcqueen

src/bitcolumnmatrix.rs

@@ -1,12 +1,42 @@
 use num_traits::{PrimInt, Unsigned, Zero, One};
 use std::ops::{BitAnd};
 
+
+trait BitWidth {
+    const BIT_WIDTH: usize;
+}
+
+impl BitWidth for u128 {
+    const BIT_WIDTH: usize = 128;
+}
+
+impl BitWidth for u64 {
+    const BIT_WIDTH: usize = 64;
+}
+
+impl BitWidth for u32 {
+    const BIT_WIDTH: usize = 32;
+}
+
+impl BitWidth for u16 {
+    const BIT_WIDTH: usize = 16;
+}
+
+impl BitWidth for u8 {
+    const BIT_WIDTH: usize = 8;
+}
+
+
 #[derive(Clone)]
-pub struct BitColumnMatrix32 {
-    columns: [u32; 32],
+pub struct BitColumnMatrix<T>
+    where T: PrimInt + Unsigned + std::marker::Sized,
+{
+    columns: [T; std::mem::size_of::<T>() * 8],
 }
 
-impl BitColumnMatrix32 {
+impl<T> BitColumnMatrix<T>
+    where T: BitWidth,
+{
     const WIDTH: usize = 32;
 
     pub fn new(init_data: &[u32; 32]) -> BitColumnMatrix32 {