To use the node in your project you should have the akate/string-number library installed. Use the “File → Add Library” menu item in XOD IDE if you don’t have it yet. See Using libraries for more info.
C++ implementation
struct State {
};
{{ GENERATED_CODE }}
void evaluate(Context ctx) {
auto state = getState(ctx);
auto str = getValue<input_IN>(ctx);
char _str[16];
dump(str,_str);
emitValue<output_OUT>(ctx, atof(_str));
}