message: Improves a debug error message in slam's ZeroOffset::isValid()
diff: @@ -59,6 +59,7 @@ public:
  inline IntType& operator()() { return offset(); }
  inline bool isValid(bool) const { return true; }
  +
  private:
  IntType m_off;
  };
  @@ -104,7 +105,7 @@ struct ZeroOffset
  SLIC_ASSERT_MSG(
  val == DEFAULT_VALUE,
  "slam::ZeroOffset policy -- tried to initialize a NoOffset policy"
  - << " with (" << val << ", but should always be 0");
  + << " with offset value " << val << ", but should always be 0");
  }
  inline IntType offset() const { return DEFAULT_VALUE; }
  