tqchen commented on a change in pull request #4628: [Object] Add String 
container
URL: https://github.com/apache/incubator-tvm/pull/4628#discussion_r376801684
 
 

 ##########
 File path: include/tvm/runtime/container.h
 ##########
 @@ -274,7 +298,246 @@ class ADT : public ObjectRef {
   TVM_DEFINE_OBJECT_REF_METHODS(ADT, ObjectRef, ADTObj);
 };
 
+/*! \brief An object representing string. It's POD type. */
+class StringObj : public Object {
+ public:
+  /*! \brief The length of the string object. */
+  uint32_t size;
+
+  /*! \brief The pointer to string data. */
+  const char* data;
+
+  static constexpr const uint32_t _type_index = TypeIndex::kDynamic;
+  static constexpr const char* _type_key = "runtime.String";
+  TVM_DECLARE_FINAL_OBJECT_INFO(StringObj, Object);
+
+ private:
+  /*! \brief String object which is moved from std::string container. */
+  class FromStd;
+
+  friend class String;
+};
+
+/*!
+ * \brief Reference to string objects.
+ *
+ * \code
+ *
+ * // Example to create runtime String reference object from std::string
+ * std::string s = "hello world";
+ *
+ * // You can create the reference from existing std::string
+ * String ref{std::move(s)};
+ *
+ * // You can rebind the reference to another string.
+ * ref = std::string{"hello world2"};
+ *
+ * // You can use the reference as hash map key
+ * std::unordered<String, int32_t) m;
+ * m[ref] = 1;
+ *
+ * // You can compare the reference object with other string objects
+ * assert(ref == "hello world", true);
+ *
+ * // You can convert the reference to std::string again
+ * string s2 = (string)ref;
+ *
+ * \endcode
+ */
+class String : public ObjectRef {
+ public:
+  /*!
+   * \brief Construct a new String object
+   *
+   * \param other The moved/copied std::string object
+   *
+   * \note If user passes const reference, it will trigger copy. If it's 
rvalue,
+   * it will be moved into other.
+   */
+  inline explicit String(std::string other);
+
+  /*!
+   * \brief Change the value the reference object points to.
+   *
+   * \param other The value for the new String
+   *
+   */
+  inline String operator=(std::string other);
+
+  /*!
+   * \brief Compare is equal to other std::string
+   *
+   * \param other The other string
+   *
+   * \return the comparison result
+   */
+  bool operator==(const std::string& other) const {
+    return size() == other.size() &&
+           other.compare(0, other.size(), get()->data, size()) == 0;
+  }
+
+  /*!
+   * \brief Compare is not equal to other std::string
+   *
+   * \param other The other string
+   *
+   * \return the comparison result
+   */
+  bool operator!=(const std::string& other) const { return !operator==(other); 
}
+
+  /*!
+   * \brief Compare is equal to other char string
+   *
+   * \param other The other char string
+   *
+   * \return the comparison result
+   */
+  bool operator==(const char* other) const { return !operator!=(other); }
+
+  /*!
+   * \brief Compare is not equal to other char string
+   *
+   * \param other The other char string
+   *
+   * \return the comparison result
+   */
+  bool operator!=(const char* other) const {
+    return size() != std::strlen(other) || compare(other, size()) != 0;
+  }
+
+  /*!
+   * \brief Compares this to other for at most len chars
+   *
+   * \return zero if both char sequences compare equal. negative if this appear
 
 Review comment:
   document all the parameters via \param

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