Convert double and vertex handle into a string in c++

Question

I want to convert a vertex handle(vit) and double value to string and write it into a file.I thought this works.

string buffer = vit->point() + " " +z_co[vit->id] +"\n";

z_co:is a vector.(double) But,it is throwing error.So,How could I do this?

Answer 1

You can't append a double to string like that.

Instead use e.g. std::ostringstream:

std::ostringstream os;
os << vit->point() << " " << z_co[vit->id] << '\n';
std::string buffer = os.str();