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  1. using System;
  2. using System.Diagnostics;
  3. using System.Drawing;
  4. using System.IO;
  5. using System.Reflection;
  6. using System.Runtime.CompilerServices;
  7. using System.Runtime.InteropServices;
  8. using System.Text;
  9. using System.Windows.Forms;
  10.  
  11. namespace BlittableStructure {
  12. 	static class Program {
  13. 		delegate uint SizeOfType(Type type);
  14. 		static SizeOfType SizeOf = typeof(Marshal).GetMethod("SizeOfType", BindingFlags.NonPublic | BindingFlags.Static).CreateDelegate(typeof(SizeOfType)) as SizeOfType;
  15.  
  16. 		static class Blittable<T> where T : struct {
  17. 			public static readonly int Size = (int)SizeOf(typeof(T));
  18. 			public static readonly unsafe void* Handle = typeof(T).TypeHandle.Value.ToPointer();
  19. 		}
  20.  
  21. 		[FixedAddressValueType]
  22. 		static readonly unsafe void* handle  = typeof(Array).TypeHandle.Value.ToPointer(),
  23. 			type = typeof(byte[]).TypeHandle.Value.ToPointer();
  24.  
  25. 		[MethodImpl(MethodImplOptions.AggressiveInlining, MethodCodeType = MethodCodeType.IL)]
  26. 		static unsafe T Read<T>(this Stream input) where T : struct {
  27. 			var size = Blittable<T>.Size;
  28. 			var tref = stackalloc byte[IntPtr.Size * 5 + size];
  29. 			var inst = (void**)tref + 3;
  30. 			inst[1] = (void*)size;
  31. 			inst[0] = handle;
  32. 			inst[-2] = type;
  33. 			inst[-3] = &inst;
  34. 			if(input.Read( __refvalue(*(TypedReference*)tref, byte[]), 0, size) < size) throw new EndOfStreamException();
  35. 			inst[-3] = inst + 2;
  36. 			inst[-2] = Blittable<T>.Handle;
  37. 			return __refvalue( *(TypedReference*)tref,T);
  38. 		}
  39. 		/// <summary>
  40. 		/// アプリケーションのメイン エントリ ポイントです。
  41. 		/// </summary>
  42. 		[STAThread]
  43. 		static unsafe void Main(string[] args) {
  44. 			Application.EnableVisualStyles();
  45. 			Application.SetCompatibleTextRenderingDefault(false);
  46. 			//Application.Run(new Form1());
  47. 			try {
  48. 				var i = 100000;
  49. 				var stack = stackalloc int[i];
  50. 				stack[1] = 1;
  51. 				stack[2] = 2;
  52. 				stack[3] = 3;
  53. 				stack[4] = 4;
  54. 				using(var mem = new UnmanagedMemoryStream((byte*)stack, sizeof(int) * i))
  55. 				using(var bin = new BinaryReader(mem, Encoding.ASCII, true)) {
  56. 					var sw = Stopwatch.StartNew();
  57. 					mem.Read<int>();
  58. 					Console.WriteLine(mem.Read<Rectangle>());
  59.  
  60. 					mem.Seek(0L, SeekOrigin.Begin);
  61. 					sw.Restart();
  62. 					while(--i >= 0) mem.Read<int>();
  63. 					Console.WriteLine(sw.ElapsedTicks);
  64.  
  65. 					i = 100000;
  66.  
  67. 					mem.Seek(0L, SeekOrigin.Begin);
  68. 					sw.Restart();
  69. 					while(--i >= 0) bin.ReadInt32();
  70. 					Console.WriteLine(sw.ElapsedTicks);
  71. 				}
  72. 			} catch(Exception e) {
  73. 				Console.WriteLine(e);
  74. 			}
  75. 		}
  76. 	}
  77. }
  78.  
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cs(18,27): error CS0227: Unsafe code requires the `unsafe' command line option to be specified
prog.cs(22,19): error CS0227: Unsafe code requires the `unsafe' command line option to be specified
prog.cs(26,10): error CS0227: Unsafe code requires the `unsafe' command line option to be specified
prog.cs(43,10): error CS0227: Unsafe code requires the `unsafe' command line option to be specified
Compilation failed: 4 error(s), 0 warnings
stdout
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Standard output is empty
https://ideone.com/YJ6bBz
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language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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