ILSpy/ICSharpCode.Decompiler.Tests/TestCases/Pretty/Using.cs

// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
// 
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// to whom the Software is furnished to do so, subject to the following conditions:
// 
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// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Threading;

namespace ICSharpCode.Decompiler.Tests.TestCases.Pretty
{
	internal class Using
	{
		[StructLayout(LayoutKind.Sequential, Size = 1)]
		private struct UsingStruct : IDisposable
		{
			public UsingStruct(int i)
			{
				Console.WriteLine(i);
			}

			void IDisposable.Dispose()
			{
				throw new NotImplementedException();
			}
		}

		private struct TypeA_Issue3385 : IDisposable
		{
			private int dummy;

			public void Dispose()
			{
			}

#if !ROSLYN3
			public static implicit operator TypeB_Issue3385(TypeA_Issue3385 a)
			{
#if CS71
				return default;
#else
				return default(TypeB_Issue3385);
#endif
			}
#else
			public static implicit operator TypeB_Issue3385(in TypeA_Issue3385 a)
			{
#if CS71
				return default;
#else
				return default(TypeB_Issue3385);
#endif
			}
#endif
		}

		private struct TypeB_Issue3385
		{
			private int dummy;
		}

#if CS80
		[StructLayout(LayoutKind.Sequential, Size = 1)]
		public ref struct UsingRefStruct
		{
			public int i;

			public UsingRefStruct(int i)
			{
				this.i = i;
				Console.WriteLine(i);
			}

			public void Dispose()
			{
				throw new NotImplementedException();
			}
		}
#endif

#if LEGACY_CSC
		// roslyn optimizes out the try-finally; mcs has a compiler bug on using(null-literal)
		public void SimpleUsingNullStatement()
		{
			using (null)
			{
				Console.WriteLine("using (null)");
			}
		}
#endif

		public void SimpleUsingExpressionStatement()
		{
			using (new MemoryStream())
			{
				Console.WriteLine("using-body");
			}
		}

		public void SimpleUsingExpressionStatementWithDeclaration()
		{
			using (MemoryStream memoryStream = new MemoryStream())
			{
				memoryStream.WriteByte(42);
				Console.WriteLine("using-body: " + memoryStream.Position);
			}
		}

		public void UsingStatementThatChangesTheVariable()
		{
			CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
			using (cancellationTokenSource)
			{
				cancellationTokenSource = new CancellationTokenSource();
			}
			cancellationTokenSource.Cancel();
		}

		public void UsingStatementOnStruct()
		{
			using (new UsingStruct(1))
			{
				Console.WriteLine("using-body");
			}
		}

		public void UsingStatementOnStructWithVariable()
		{
			using (UsingStruct usingStruct = new UsingStruct(2))
			{
				Console.WriteLine("using-body: " + usingStruct);
			}
		}

		private void UsingStatementOnNullableStruct(UsingStruct? us)
		{
			using (us)
			{
				Console.WriteLine("using-body: " + us.ToString());
			}
		}

		public void GenericUsing<T>(T t) where T : IDisposable
		{
			using (t)
			{
				Console.WriteLine(t);
			}
		}

		public void GenericStructUsing<T>(T t) where T : struct, IDisposable
		{
			using (t)
			{
				Console.WriteLine(t);
			}
		}

		public void GenericClassUsing<T>(T t) where T : class, IDisposable
		{
			using (t)
			{
				Console.WriteLine(t);
			}
		}

		public void GenericNullableUsing<T>(T? t) where T : struct, IDisposable
		{
			using (t)
			{
				Console.WriteLine(t);
			}
		}

#if CS80
		public void UsingRefStruct1(UsingRefStruct s)
		{
			using (s)
			{
				Console.WriteLine(s.i);
			}
		}
#endif

		public static void Issue3385()
		{
#if ROSLYN3
#if CS71
			using (TypeA_Issue3385 a = default)
#else
			using (TypeA_Issue3385 a = default(TypeA_Issue3385))
#endif
#else
#if CS71
			using (TypeA_Issue3385 typeA_Issue = default)
#else
			using (TypeA_Issue3385 typeA_Issue = default(TypeA_Issue3385))
#endif
#endif
			{
#if ROSLYN3
				Empty(a);
#else
				Empty(typeA_Issue);
#endif
			}
		}

		private static void Empty(TypeB_Issue3385 b)
		{
		}
	}
}