Extend the input and output type?

[fanbin]

Hi,

I was thinking about registering custom input/return functions like:

static std::vector<float> aggregate(MathPresso::mreal_t x, MathPresso::mreal_t y) {
    std::vector<float> ret;
        ret.push_back(x);
        ret.push_back(y);
        ret.push_back(x+y);
        return ret;
}

// and then
 ctx.addFunction("agg", (void *) aggregate, MathPresso::MFUNC_F_ARG2);

Compiles OK, but as evaluated, the expression returns real type, which crashes of course.

Is there a way that I can define functions working on vector type?