ClassSerialization.cpp

struct SomeData {
	template<class Archive>
	void serialize(Archive & archive);
	
	std::string mName;
	float		    mFloat0, mFloat1;
};

template<class Archive>
void SomeData::serialize(Archive & archive)
{
	archive( mName, mFloat0, mFloat1 );
}

std::vector<SomeData> 	mMyData;
float 			mSomeOtherData0;
bool 			mSomeOtherData1;

FileIO.cpp

void SerialiseApp::fileOpen( bool forceDefault )
{
	fs::path path = forceDefault ? getAssetPath( "" ) / "default.json" : getOpenFilePath();
	if( !path.empty() && fs::exists( path ) ){
		try {
			std::ifstream is( path.c_str() );
			cereal::JSONInputArchive archive( is );
			archive( mMyData, mSomeOtherData0, mSomeOtherData1 );
			mCurrentFilePath = path;
		}
		catch( const std::exception &exc ){
			CI_LOG_EXCEPTION( "Open File", exc );
		}
	}
}
void SerialiseApp::fileSave( bool forceDefault )
{
	fs::path path = mCurrentFilePath;
	if( path.empty() || forceDefault ){
		path = getAssetPath( "" ) / "default.json";
	}
	std::ofstream os( path.c_str() );
	cereal::JSONOutputArchive archive( os );
	archive( mMyData, mSomeOtherData0, mSomeOtherData1 );
}
void SerialiseApp::fileSaveAs()
{
	fs::path path = getSaveFilePath();
	if( !path.empty() ){
		std::ofstream os( path.c_str() );
		cereal::JSONOutputArchive archive( os );
		archive( mMyData, mSomeOtherData0, mSomeOtherData1 );
		mCurrentFilePath = path;
	}
}

UserInterface.cpp

{
		ui::ScopedMainMenuBar mainMenu;
		
		// File Menu
		if( ui::BeginMenu( "File" ) ) {
			if( ui::MenuItem( "New" ) )
				fileNew();
			if( ui::MenuItem( "Open" ) )
				fileOpen();
			if( ui::MenuItem( "Save" ) )
				fileSave();
			if( ui::MenuItem( "Save As" ) )
				fileSaveAs();
			
			ui::EndMenu();
		}
	}