Question

Hi I created a firebreath project. I added this methods to the default generated code:

In the application API header file (MYAppAPI.h):

FB_JSAPI_EVENT(bgp, 3, (const FB::variant&, bool, int));

std::string bgp(std::string& val);

In the application API source file (MAppAPI.mm I am using objective-c):

registerMethod("bgp", make_method(this, &MyAppAPI::bgp));

std::string MyAppAPI::bgp(std::string& val){...}

But when I build the code, I am getting this error:

…firebreath/src/ScriptingCore/MethodConverter.h:115: error: invalid initialization of non-const reference of type ‘std::string&’ from a temporary of type ‘std::basic_string, std::allocator >’

Any ideas?

Answer 1

that should read:

std::string MyAppAPI::bgp(const std::string& val){...}

note the const. You can’t pass things by reference into a JS function, so it won’t let you pass a non-const reference.