C++: proxy.operator=(proxy)

ipaacalib/cpp/include/ipaaca/ipaaca-payload.h

@@ -300,6 +300,7 @@ IPAACA_HEADER_EXPORT class PayloadEntryProxy//{{{
 			_payload->set(_key, new_entry);
 			return *this;
 		}
+		IPAACA_HEADER_EXPORT PayloadEntryProxy& operator=(const PayloadEntryProxy& otherproxy);
 		
 		//IPAACA_HEADER_EXPORT PayloadEntryProxy& operator=(const std::string& value);
 		//IPAACA_HEADER_EXPORT PayloadEntryProxy& operator=(const char* value);

ipaacalib/cpp/src/ipaaca-json.cc

@@ -39,6 +39,42 @@
 using namespace rapidjson;
 using namespace std;
 
+int json_testbed_main(int argc, char** argv)
+{
+	std::string json_source("[\"old\",2,3,4]");
+	ipaaca::PayloadDocumentEntry::ptr entry = ipaaca::PayloadDocumentEntry::from_json_string_representation(json_source);
+	
+	std::string newinner("{\"K\":\"V\"}");
+	ipaaca::PayloadDocumentEntry::ptr entrynew = ipaaca::PayloadDocumentEntry::from_json_string_representation(newinner);
+	
+	ipaaca::FakeIU::ptr iu = ipaaca::FakeIU::create();
+	iu->add_fake_payload_item("a", entry);
+	iu->add_fake_payload_item("b", entrynew);
+	
+	auto proxy = iu->payload()["a"][3];
+	std::cout << proxy << std::endl;
+	
+	std::cout << "IU payload before: " << iu->payload() << std::endl;
+	std::cout << "Entry before:      " << entry << std::endl;
+	std::cout << "EntryNew before:   " << entrynew << std::endl;
+	
+	/*
+	proxy.json_value->CopyFrom(entrynew->document, proxy.document_entry->document.GetAllocator());
+	proxy.document_entry->update_json_source();
+	*/
+	proxy = iu->payload()["b"];
+	
+	std::cout << "Newly written part: " << iu->payload()["a"][3] << std::endl;
+	iu->payload()["a"][3]["addkey"] = "addvalue";
+	
+	std::cout << "IU payload after: " << iu->payload() << std::endl;
+	std::cout << "Entry after:      " << entry << std::endl;
+	std::cout << "EntryNew after:   " << entrynew << std::endl;
+	
+	return 0;
+}
+
+
 int fakeiu_main(int argc, char** argv)
 {
 	//if (argc<2) {
@@ -254,7 +290,8 @@ int main(int argc, char** argv)
 	ipaaca::CommandLineParser::ptr parser = ipaaca::CommandLineParser::create();
 	ipaaca::CommandLineOptions::ptr options = parser->parse(argc, argv);
 
-	return legacy_iu_main(argc, argv);
+	return json_testbed_main(argc, argv);
+	//return legacy_iu_main(argc, argv);
 	//return fakeiu_main(argc, argv);
 	//return iu_main(argc, argv);
 }

ipaacalib/cpp/src/ipaaca-payload.cc

@@ -454,6 +454,19 @@ IPAACA_EXPORT PayloadEntryProxy PayloadEntryProxy::operator[](int addr_idx_)
 	return operator[]((size_t) addr_idx_);
 }
 
+IPAACA_EXPORT PayloadEntryProxy& PayloadEntryProxy::operator=(const PayloadEntryProxy& otherproxy)
+{
+	PayloadDocumentEntry::ptr new_entry = document_entry->clone(); // copy-on-write, no lock required
+	rapidjson::Value& newval = new_entry->get_or_create_nested_value_from_proxy_path(this);
+	auto valueptr = otherproxy.json_value;
+	if (valueptr) { // only set if value is valid, keep default null value otherwise
+		newval.CopyFrom(*valueptr, new_entry->document.GetAllocator());
+	}
+	new_entry->update_json_source();
+	_payload->set(_key, new_entry);
+	return *this;
+}
+
 /*
 IPAACA_EXPORT PayloadEntryProxy& PayloadEntryProxy::operator=(const std::string& value)
 {