void save(file& fp, unsigned depth = 0) {
for(auto& child : children) {
if(child.desc) {
for(unsigned n = 0; n < depth; n++) fp.print(" ");
fp.print("//", child.desc, "\n");
}
for(unsigned n = 0; n < depth; n++) fp.print(" ");
fp.print(child.name);
if(!child.empty()) fp.print(": ", child.get());
fp.print("\n");
child.save(fp, depth + 1);
if(depth == 0) fp.print("\n");
}
}
template<typename... Args> void print(Args&&... args) {
fp.print(std::forward<Args>(args)...);
}
