Help with basic templating of Point<int>?

Getting Started
1

Hi,
I am no programmer and I don’t know any. I can’t get the following addition to work in varaiant.h. Any help would be much appreciated. I have tried typedefing

point<int>

, changing

template <typename Type>

to

template <class Type>

and many other options. No luck.
Thank you

Here is the code I am having difficulty with

    template <> struct VariantConverter<Point<int>>
    {
        static Point<int> fromVar (const var& v)
        {
            return Point<int>
            (
             { v[0].operator int(), v[1].operator int() }
             );
        }
        static var toVar (const Point<int>& p)
        {
            return Array<var>(
                               { p.getX(), p.getY() }
                               );
        }
    };
2

perhaps something like

template <>
struct VariantConverter<Point<int>>
{
    static Point<int> fromVar (const var& v)           { return { v[0], v[1] }; }
    static var toVar (const Point<int>& p)             { return Array<var> { p.x, p.y }; }
};
3

Hi Jules,
I am taking my day off, but that didn’t work for me. I will try reinstalling JUCE tomorrow. Maybe I have messed up the JUCE code somewhere.
Thank you.

4

It would be useful if you explained how it didn’t work for you? (Show your code that tries using it.)

5

Both versions working now. I haven’t changed anything yet. Was getting two Xcode errors despite many variations. I was not implementing any instances yet.
The errors were

/Tools/JUCE/modules/juce_core/containers/juce_Variant.h:41:18: Expected unqualified-id

and

/Tools/JUCE/modules/juce_core/containers/juce_Variant.h:343:46: Expected ‘>’

Not sure what that was, but I am very happy.
Thank you Jules and Xenakios.

1 Like
6

Hi,
Once I test

    CachedValue<juce::Point<int>>  pointTest;

the errors start again. The code assumes one get an

Array<var>

from a

var&

The code doesn’t appear to work even with a further templated passing of

property.getArray()

from cached_value.h.

Anyone have any tricky thoughts on how to make this less tricky. Once one can save Point to a cachedValue, then one can translate the principle to further types like Rectangles. This will make it easy to save these types to valuetree via linked cachedValues, which has a lot of uses.
Thank you

7

CachedValue referTo not working has a better idea.

They use StringArray rather than Array.

8

Hi,
Programming has those nightmare days all blurred into one. Trying to get the basic cachedValue working has been part of a little nightmare. I am using Dave’s variant converter.

    template <> struct VariantConverter<Colour>
    {
        static Colour fromVar (const var& v)
        {
            return Colour::fromString ( v.toString() );
        }
        static var toVar (const Colour& c)
        {
            return c.toString();
        }
    };

with

     CachedValue<Colour> test;
     Colour colourTest;
     ValueTree tempColourTree;

and

     colourTest      =  Colours::black;
     tempColourTree  =  valueTree.getChildWithName("colourTest");
     test.referTo (tempColourTree, "Colour", nullptr);
     test.setValue (colourTest, nullptr);

Am I missing something?
Thank you