<commit_before>#pragma once
#include "../base/assert.hpp"
#include "../base/base.hpp"
#include "../std/string.hpp"
#include "../std/sstream.hpp"
#include "../std/utility.hpp"


namespace m2
{

template <int kDepthLevels> class CellId
{
public:
  enum { DEPTH_LEVELS = kDepthLevels };
  enum { MAX_COORD = 1 << DEPTH_LEVELS };

  explicit CellId(string const & s)
  {
    *this = FromString(s);
  }
<commit_msg>Add default constructor to CellId.<commit_after>#pragma once
#include "../base/assert.hpp"
#include "../base/base.hpp"
#include "../std/string.hpp"
#include "../std/sstream.hpp"
#include "../std/utility.hpp"


namespace m2
{

template <int kDepthLevels> class CellId
{
public:
  enum { DEPTH_LEVELS = kDepthLevels };
  enum { MAX_COORD = 1 << DEPTH_LEVELS };

  CellId() : m_Bits(0), m_Level(0)
  {
    ASSERT(IsValid(), ());
  }

  explicit CellId(string const & s)
  {
    *this = FromString(s);
  }

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