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    /// <summary>
    /// A simple wrapper of a <see cref="Lazy"/> type that require a <see cref="IDisposable"/> object 
    /// to evaluate its value. The resulting object is also disposable.
    /// 
    /// Note: provides only 3 constructors. The 3 of <see cref="Lazy"/> that depends on the default
    /// constructure does not make sense here.
    /// </summary>
    /// <typeparam name="T">The type of the disposable object</typeparam>
    /// <typeparam name="R">The type of the lazily evaluated value</typeparam>
    public class DisposableLazy<T, R> : IDisposable where T:IDisposable

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    class CPSExpressionVisitor : ExpressionVisitor
    {
        delegate R SFunc<T, R>(T v);
        delegate SFunc<T2, R> SFunc<T1, T2, R>(T1 v);
        delegate SFunc<T2, T3, R> SFunc<T1, T2, T3, R>(T1 v);
        delegate SFunc<T2, T3, T4, R> SFunc<T1, T2, T3, T4, R>(T1 v);

        delegate dynamic FDynamic(FDynamic s);

        private static FDynamic ConstFDynamic<T>(T v)

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<UserControl x:Class="WPFZoomText.ZoomViewer"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:WPFZoomText"
             mc:Ignorable="d" 
             d:DesignHeight="500" d:DesignWidth="500">
    <Grid Background="Black" MouseDown="Grid_MouseDown" MouseUp="Grid_MouseUp" MouseWheel="Grid_MouseWheel"
          SizeChanged="Grid_SizeChanged">

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using System;
using System.Threading;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Threading;

namespace WPFZoomTest
{

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    public class UIThreadDrawingCanvas : FrameworkElement, IZoomFit
    {
        public static readonly DependencyProperty ContentDomainProperty = DependencyProperty.Register(
            "ContentDomain", typeof(Rect), typeof(UIThreadDrawingCanvas));
        public static readonly DependencyProperty RenderRequestProperty = DependencyProperty.Register(
            "RenderRequest", typeof(ContextDrawer), typeof(UIThreadDrawingCanvas),
            new FrameworkPropertyMetadata(null, RenderRequestChanged));
        public static readonly DependencyProperty BackgroundProperty = DependencyProperty.Register(
            "Background", typeof(Brush), typeof(UIThreadDrawingCanvas),
            new FrameworkPropertyMetadata(Brushes.Transparent));

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    public static class NotificationExtensions
    {
        private static string PropertyFromMemberExpression(MemberExpression memberExpression)
        {
            var pinfo = memberExpression.Member as PropertyInfo;
            if (pinfo != null)
            {
                return pinfo.Name;
            }
            var finfo = memberExpression.Member as FieldInfo;

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    public static class EmptyHandlers
    {
        public static void EmptyHandler<T, U>(T s, U e) { }
    }

    public static class EntityExt
    {
        private static string PropertyFromMemberExpression(MemberExpression memberExpression)
        {
            var pinfo = memberExpression.Member as PropertyInfo;

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module PushParser where

import Data.Monoid
import Control.Applicative
import Control.Monad


{-
t is the type of tokens, r is the type of results.
Empty result set means the parsing do not have a result at the moment.

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