clarify obj creation, declare static field for....HEADmaster

counting, introduce outward conversion to 'const char *' without
a copy, implement != operator

1 files changed, 19 insertions, 8 deletions

diff --git a/string.h b/string.h
index dbc8e88..2e86086 100644
--- a/string.h
+++ b/string.h
@@ -17,11 +17,14 @@ class MyString
         char *str_;
         int length_;
         MyString(int);
+        static size_t count;
 
     public:
         MyString();
-        MyString(char);
+        explicit MyString(char);
+        /* allow implicit conversions, it is useful */
         MyString(const char *);
+        /* copy constructor */
         MyString(const MyString &);
         MyString& operator=(const MyString &);
         ~MyString();
@@ -33,29 +36,33 @@ class MyString
         MyString& concat(const MyString &);
         MyString& concat(const char *);
         void printStr(void) const;
+        static size_t getCount(void);
 
         bool operator!(void) const;
         char& operator[](int);
         char operator[](int) const;
         operator char*(); /* outward class conversion into char * */
+        operator const char*() const;
 };
 
 bool operator==(const MyString&, const MyString &);
+bool operator!=(const MyString&, const MyString &);
 std::ostream& operator<<(std::ostream&, const MyString &);
 
-inline MyString::MyString()
+/* it is always good idea to have default ctor to avoid manual init later
+ * for data types that include this class type
+ */
+inline MyString::MyString() : str_(new char[1]), length_(0)
 {
-    length_ = 0;
-    str_ = new char[1];
     str_[0] = '\0';
+    this->count++;
 }
 
-inline MyString::MyString(char ch)
+inline MyString::MyString(char ch) : str_(new char[2]), length_(1)
 {
-    length_ = 1;
-    str_ = new char[2];
     str_[0] = ch;
     str_[1] = '\0';
+    this->count++;
 }
 
 inline int MyString::length() const
@@ -68,5 +75,9 @@ inline void MyString::printStr(void) const
     std::cout << "length: " << length_ << ", value: \"" << str_ << "\"";
 }
 
-#endif
+inline size_t MyString::getCount(void)
+{
+    return count;
+}
 
+#endif