Implementing copy ctor and equality operator between easyjson objects

picojson.h

@@ -1225,13 +1225,22 @@ class easyjson
     holder(std::make_unique<value_ptr_holder>(d)) {
   }
 
+  // Copy constructor
+
+  easyjson(const easyjson & other) :
+    holder(std::make_unique<value_ptr_holder>()) {
+      get_value() = other.get_value();
+  }
+
+
   // picojson::value accessor
 
-  value & get_value()
+  value & get_value() const
   {
     return holder->get();
   }
 
+
   // Equality operators
 
   easyjson & operator=(bool value) {
@@ -1264,6 +1273,12 @@ class easyjson
     return *this;
   }
 
+  easyjson & operator=(const easyjson & other) {
+    holder = std::make_unique<value_ptr_holder>();
+    get_value() = other.get_value();
+    return *this;
+  }
+
   // Assignment operators
 
   easyjson operator[](const std::string & s) {

test.cc

@@ -391,5 +391,22 @@ int main(void)
     _ok(v[12].get_value().get<std::string>() == "foo", "equals value");
   }
 
+  {
+    picojson::easyjson v, v_equal;
+    v["foo"] = "bar";
+    v_equal = v;
+    picojson::easyjson v_copy(v);
+
+    _ok(v["foo"].get_value().get<std::string>() == v_copy["foo"].get_value().get<std::string>(), "copy equals original");
+    _ok(v["foo"].get_value().get<std::string>() == v_equal["foo"].get_value().get<std::string>(), "equality assigned to original");
+
+    v_copy["foo"] = "baz";
+    v_equal["foo"] = "picojson rocks !";
+
+    _ok(v["foo"].get_value().get<std::string>() == "bar", "original not modified");
+    _ok(v_copy["foo"].get_value().get<std::string>() == "baz", "changed value in copy is OK");
+    _ok(v_equal["foo"].get_value().get<std::string>() == "picojson rocks !", "changed value after equality is OK");
+  }
+
   return done_testing();
 }