phone_number: ...

cpp/phone-number/phone_number.cpp

@@ -0,0 +1,26 @@
+#include "phone_number.h"
+
+#include <algorithm>
+#include <ctype>
+
+using namespace std;
+
+phone_number::phone_number(const string &str)
+{
+    static const string invalid_number = "0000000000";
+}
+
+string phone_number::number() const
+{
+    return number_;
+}
+
+string phone_number::area_code() const
+{
+    return area_code_;
+}
+
+phone_number::operator string() const
+{
+    return number_;
+}