Hey folks - would a range based for loop solution be nice for anyone else?
void func(ValueTree & tree)
{
for (auto & child: tree.children())
doSomething(child);
for (auto & property: tree.properties())
doSomethingElse(property);
}
And similarly for children of components and other important objects..?
definitely yes :)
Maybe, for example, as a class inside class ValueTree { ... };
/** Provides an STL compatible iterator for the children. */
class ChildrenConnector
{
public:
ChildrenConnector(ValueTree & tree) : tree(tree) {}
class Iterator
{
public:
Iterator(ValueTree & tree, int position) : tree(tree), pos(position) {}
Iterator & operator++() { ++pos; return *this; }
bool operator!= (const Iterator & other) const { return other.pos != pos || other.tree != tree; }
ValueTree operator * () const { return tree.getChild(pos); }
private:
ValueTree & tree;
int pos;
};
Iterator begin() { return Iterator(tree, 0); }
Iterator end() { return Iterator(tree, tree.getNumChildren()); }
private:
ValueTree & tree;
};
/** Obtain an object that can be used with range based for-loops over the children. */
ChildrenConnector children() { return ChildrenConnector(*this); }
And similarly for the Properties.
PropertyConnector properties() { return PropertyConnector(*this); }
Might need some fancy polish to work with more of the STL functions - but that works for the range for-loop. And seems to generate some pretty tight code...
Overloading std::begin and std::end should make most stuff work.
It would, but there are two different containers inside ValueTree for example, properties and children. I think that preculdes that approach?
Ah - but I can just use it like this and it's okay: :)
void DeviceTreeDataPanel::refreshDeviceListFromState()
{
for (auto c : ChildrenConnector(tree))
{
// blah
}
}
Super easy :)
Any chance of this or similar making it into the official ValueTree class?
Yes, there's a good chance, as I'd find it useful too! Just need to find time to do it!
would be pretty useful!
Most excellent.
