Detect supported features?

[vladdeSV]

Should scone detect if certain features are available to use?

For instance

• Key releases are not supported on POSIX systems. Can be checked at compile time.
• RGB color might be supported on POSIX, not really on Windows (unless it is, who knows /shrug). Must be detected at runtime.

For instance, it is completely legal to write the following if(input.pressed == false) { /+ ... +/ }, but on any POSIX system this will never be true. input.pressed will undenieably, without a doubt, always be true on any POSIX system.

Furthermore, frame.write(0,0, Color.rgb(10,20,30), "test"); on an unsupported POSIX terminal will result in garbage being printed (I think). Is it up to scone to detect this, or up to the user to ensure the program is run on supported software?

[vladdeSV]

The input.pressed part could be made so it's not even compiled for POSIX using version.

version(Windows)
struct KeyboardEvent
{
    auto hasControlKey(SCK ck)
    {
        return controlKey.hasFlag(ck);
    }

    public SK key;
    public SCK controlKey;
    public bool pressed;
}

version(Posix)
struct KeyboardEvent
{
    auto hasControlKey(SCK ck)
    {
        return controlKey.hasFlag(ck);
    }

    public SK key;
    public SCK controlKey;
}

This means anyone relying on input.pressed will not be able to make the application cross-platform. This is good, since it errors at compile time that the library depends on non-cross-platform features to function.

[vladdeSV]

Or maybe even...

private template Foo
{
    auto hasControlKey(SCK ck)
    {
        return controlKey.hasFlag(ck);
    }

    public SK key;
    public SCK controlKey;
}

version(Windows)
struct KeyboardEvent
{
    mixin Foo;
    public bool pressed;
}

version(Posix)
struct KeyboardEvent
{
    mixin Foo;
}

[vladdeSV]

Maybe the whole input.pressed should be moved into its own discussion?