Context and System.IDisposable

final class VKTest
{
    /// <summary>
    /// Class entry point. The system will call this method when a designated menu 
    /// is selected or when execution starts and this class is set as the startup class.
    /// </summary>
    /// <param name = "_args">The specified arguments.</param>
    public static void main(Args _args)
    {
        info('Start using');
        using(VKTestContext context = VKTestContext::construct())
        {
            context.boolProperty = true;
            
            VKTestExecutable exec = new VKTestExecutable();
            exec.performAction();
        }

        VKTestExecutable exec = new VKTestExecutable();
        exec.performAction();
        info('End using');

        // try-finally alternative 
        info('Start try');
        VKTestContext context = VKTestContext::construct();
        try
        {
            context.boolProperty = true;
            exec = new VKTestExecutable();
            exec.performAction();
        }
        finally
        {
            context.dispose();
            context = null;
        }
        exec = new VKTestExecutable();
        exec.performAction();
        info('End try');
    }

}

/// <summary>
/// <c>VKTestContext</c> contains ... context used to ...
/// </summary>
class VKTestContext implements System.IDisposable
{
    static VKTestContext instance;
    public boolean boolProperty;

    protected void new()
    {
        if(instance)
        {
            // Nesting of %1 is not supported
            throw error(strFmt("@WAX:NestingOfContextIsNotSupportedWarning", classStr(VKTestContext)));
        }
        instance = this;
    }
    
    /// <summary>
    /// Construct method to create new instance
    /// </summary>
    /// <returns>VKTestContext</returns>
    static public VKTestContext construct()
    {
        VKTestContext ret = new VKTestContext();

        return ret;
    }

    public void dispose()
    {
        instance = null;
    }

    /// <summary>
    /// Returns current VKTestContext instance if it was previously created
    /// </summary>
    /// <returns>VKTestContext</returns>
    static public VKTestContext current()
    {
        return instance;
    }
}

class VKTestExecutable
{
    void performAction()
    {
        VKTestContext context = VKTestContext::current();
        if (context && context.boolProperty)
        {
            info("True");
        }
        else
        {
            info("False");
        }
    }
}