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// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
//
// <OWNER>GPaperin</OWNER>
// <OWNER>[....]</OWNER>
using System;
using System.Security;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.Runtime.InteropServices;
using System.Runtime.CompilerServices;
namespace System.Runtime.InteropServices.WindowsRuntime
{
// This is a set of stub methods implementing the support for the IReadOnlyCollection<T> interface on WinRT
// objects that support IVectorView<T>. Used by the interop mashaling infrastructure.
//
// The methods on this class must be written VERY carefully to avoid introducing security holes.
// That's because they are invoked with special "this"! The "this" object
// for all of these methods are not VectorViewToReadOnlyCollectionAdapter objects. Rather, they are of type
// IVectorView<T>. No actual VectorViewToReadOnlyCollectionAdapter object is ever instantiated. Thus, you will see
// a lot of expressions that cast "this" to "IVectorView<T>".
internal sealed class VectorViewToReadOnlyCollectionAdapter
{
private VectorViewToReadOnlyCollectionAdapter()
{
Contract.Assert(false, "This class is never instantiated");
}
// int Count { get }
[Pure]
[SecurityCritical]
internal int Count<T>()
{
IVectorView<T> _this = JitHelpers.UnsafeCast<IVectorView<T>>(this);
uint size = _this.Size;
if (((uint)Int32.MaxValue) < size)
{
throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_CollectionBackingListTooLarge"));
}
return (int)size;
}
}
}
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