Cleaning up some things in dna_four_bit

Author: andrewdavidsmith

dna_four_bit.cpp

@@ -64,15 +64,15 @@ char dna_four_bit_decoding[] = {
   Z = 0000 =  0 = {}        = Zero
 */
 uint8_t dna_four_bit_encoding[] = {
-/*first*/                                                               /*last*/
-/*  0*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 0*/
+/*first*/                                               /*last*/
+/*  0*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,   /* 0*/
 /* 16*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 31*/
 /* 32*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 47*/
 /* 48*/ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  /* 63*/
-/* 64*/ 0,  1, 14,  2, 13, 0, 0,  4, 11, 0, 0, 12, 0,  3, 0, 0,  /* 79*/
-/* 80*/ 0, 0,  5,  6,  8, 0,  7,  9, 0, 10,  0, 0, 0, 0, 0, 0,  /* 95*/
-/* 96*/ 0,  1, 14,  2, 13, 0, 0,  4, 11, 0, 0, 12, 0,  3, 0, 0,  /*111*/
-/*112*/ 0, 0,  5,  6,  8, 0,  7,  9, 0, 10,  0, 0, 0, 0, 0, 0   /*127*/
+/* 64*/ 0, 1,14, 2,13, 0, 0, 4,11, 0, 0,12, 0, 3, 0, 0,  /* 79*/
+/* 80*/ 0, 0, 5, 6, 8, 0, 7, 9, 0,10, 0, 0, 0, 0, 0, 0,  /* 95*/
+/* 96*/ 0, 1,14, 2,13, 0, 0, 4,11, 0, 0,12, 0, 3, 0, 0,  /*111*/
+/*112*/ 0, 0, 5, 6, 8, 0, 7, 9, 0,10, 0, 0, 0, 0, 0, 0   /*127*/
 };
-//       .   A   B   C   D   .   .   G   H   .   .   K   .   M   N   .
-//       .   .   R   S   T   .   V   W   .   Y   Z
+//      .  A  B  C  D  .  .  G  H  .  .  K  .  M  N  .
+//      .  .  R  S  T  .  V  W  .  Y  Z

dna_four_bit.hpp

@@ -115,7 +115,6 @@ struct genome_four_bit_itr {
   genome_four_bit_itr& operator--() {
     itr -= (offset == 0);
 
-    // GS: will underflow on 0 but it's ok?
     offset = (offset - 1) & 15ul;
     return *this;
   }
@@ -126,7 +125,7 @@ struct genome_four_bit_itr {
     return tmp;
   }
   genome_four_bit_itr operator+(const size_t step) const {
-    // whether the sum of offsets is >= 16 
+    // whether the sum of offsets is >= 16
     const bool shift_one_pos =
       (((offset + (static_cast<int>(step) & 15)) & 16) >> 4);