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TypeHandle.cs
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TypeHandle.cs
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using System;
using System.Collections.Concurrent;
using System.Collections.Generic;
using System.Runtime.InteropServices;
namespace Arenas {
[StructLayout(LayoutKind.Sequential)]
public readonly struct TypeHandle : IEquatable<TypeHandle> {
public readonly int Value;
public TypeHandle(int value) {
Value = value;
}
#region Equality
public override bool Equals(object obj) {
return obj is TypeHandle handle &&
Value == handle.Value;
}
public bool Equals(TypeHandle other) {
return Value == other.Value;
}
public override int GetHashCode() {
return 1909215196 + Value.GetHashCode();
}
public static bool operator ==(TypeHandle left, TypeHandle right) {
return left.Equals(right);
}
public static bool operator !=(TypeHandle left, TypeHandle right) {
return !(left == right);
}
public override string ToString() {
return GetTypeFromHandle(this).ToString();
}
#endregion
public bool HasValue { get { return Value != 0; } }
public static TypeHandle None { get { return default; } }
#region Static
private static Dictionary<Type, TypeHandle> typeToHandle;
private static Dictionary<TypeHandle, Type> handleToType;
private static object typeHandleLock;
static TypeHandle() {
typeToHandle = new Dictionary<Type, TypeHandle>();
handleToType = new Dictionary<TypeHandle, Type>();
typeHandleLock = new object();
}
public static TypeHandle GetTypeHandle(Type type) {
if (type == typeof(Exception)) {
throw new ArgumentException("Cannot pass typeof(Exception) to TypeHandle.GetTypeHandle", nameof(type));
}
TypeHandle handle;
lock (typeHandleLock) {
if (!typeToHandle.TryGetValue(type, out handle)) {
typeToHandle[type] = handle = new TypeHandle(typeToHandle.Count + 1);
if (!handle.HasValue) {
throw new OverflowException("Arena.TypeHandle value overflow: too many types");
}
handleToType[handle] = type;
}
}
return handle;
}
/// <summary>
/// This returns the Type instance for a TypeHandle or typeof(Exception) if no matching Type is found
/// </summary>
/// <param name="handle">Handle for a Type instance</param>
/// <returns>The Type instance for this TypeHandle or typeof(Exception) if no matching Type is found</returns>
public static Type GetTypeFromHandle(TypeHandle handle) {
if (!handle.HasValue) {
return typeof(Exception);
}
Type type;
lock (typeHandleLock) {
if (!handleToType.TryGetValue(handle, out type)) {
return typeof(Exception);
}
}
return type;
}
public static bool TryGetTypeFromHandle(TypeHandle handle, out Type type) {
type = null;
if (!handle.HasValue) {
return false;
}
lock (typeHandleLock) {
if (!handleToType.TryGetValue(handle, out type)) {
return false;
}
}
return true;
}
#endregion
}
}