std::variant - returning multiple types EMSCRIPTEN_BINDINGS function.

[adam crockett]

Fingers crossed someone can help me,

I am working on the last phase of my project, long story short, I am trying to get Lua values from a table back into JavaScript.
Like JavaScript, Lua is dynamically typed, I am going to be puting all sorts of values into a c++ std::map

specification for this map:

• keys can be double or string
• values can be, boolean, string, null, double and map of the same type (recursive)

For simplicity and your sake I have reduced this down somewhat.

 

std::variant<std::string, int> returnsAllSorts (){
    return stringOrInt(); // this could return either or.
}

EMSCRIPTEN_BINDINGS (my_module) {
    emscripten::function("returnsAllSorts", &returnsAllSorts);

}

 If the above wont work, what else can I try, in order to get a map with different values? 

[adam crockett]

For any future searches, the answer is to create a JavaScript object from inside your cpp.

Use emscripten::val

And return that instead of a Vector or Map.