d优化表2

import std.stdio;
import dmd.backend.aarray;
//使用后端的AA,只需要aarray.d一个就够了.
import zencoding.windows949;
struct Make_CP949Table(T)
{
  private AArray!(Tinfo!T, T) aa;

  this(T[] keys, T[] values)
  {
    foreach (i, T value; values)
    {
      T * set = aa.get(&keys[i]);
      *set = value;
    }
    aa.rehash();
  }

  T* opBinaryRight(string op)(T index)
  if (op == "in")
  {
    T* key = aa.get(&index);
    if(*key > 0) return key;

    return null;
  }

  T get(T key)
  {
    return *aa.get(&key);
  }

  size_t length()
  {
    return aa.nodes;
  }
}

Make_CP949Table!ushort cp949_table;
shared static this() { cp949_table = Make_CP949Table!ushort(keys, values); }
//阿里给你准备好了.

void main()
{
  const(ubyte[]) cp949 = [
    ...//略
    0x00, 0x00, 0x00, 0x00];

  const(ushort[]) utf16 = [
    //...略
    0xC774, 0xB354, 0x5F, 0xB0A8, 0x2E, 0x69, 0x6D, 0x66];

  cp949.fromWindows949.writeln; // 
}