stdmap.cpp

auto nameit = req.parameters.find("name");
if (nameit == req.parameters.end()) {
    // parameter not found
}
else {
    // yay, get the name out!
    auto name = nameit->first;
}

if (req.parameters.count("name") == 1) {
    // there is an item here
}
else {
    // there is not
}