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125 lines
4.0 KiB
125 lines
4.0 KiB
using System;
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using System.Diagnostics;
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using System.Reflection;
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namespace IPA.Utilities
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{
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/// <summary>
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/// Utilities to create <see cref="Ref{T}"/> using type inference.
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/// </summary>
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public static class Ref
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{
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/// <summary>
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/// Creates a <see cref="Ref{T}"/>.
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/// </summary>
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/// <typeparam name="T">the type to reference.</typeparam>
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/// <param name="val">the default value.</param>
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/// <returns>the new <see cref="Ref{T}"/>.</returns>
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public static Ref<T> Create<T>(T val)
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{
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return new Ref<T>(val);
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}
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}
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/// <summary>
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/// A class to store a reference for passing to methods which cannot take ref parameters.
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/// </summary>
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/// <typeparam name="T">the type of the value</typeparam>
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public class Ref<T> : IComparable<T>, IComparable<Ref<T>>
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{
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private T _value;
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/// <summary>
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/// The value of the reference
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/// </summary>
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public T Value
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{
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get
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{
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if (Error != null) throw Error;
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return _value;
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}
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set => _value = value;
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}
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private Exception _error;
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/// <summary>
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/// An exception that was generated while creating the value.
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/// </summary>
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public Exception Error
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{
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get
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{
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return _error;
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}
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set
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{
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value.SetStackTrace(new StackTrace(1));
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_error = value;
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}
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}
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/// <summary>
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/// Constructor.
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/// </summary>
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/// <param name="reference">the initial value of the reference</param>
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public Ref(T reference)
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{
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_value = reference;
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}
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/// <summary>
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/// Converts to referenced type, returning the stored reference.
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/// </summary>
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/// <param name="self">the object to be de-referenced</param>
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/// <returns>the value referenced by the object</returns>
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public static implicit operator T(Ref<T> self)
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{
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return self.Value;
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}
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/// <summary>
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/// Converts a value T to a reference to that object. Will overwrite the reference in the left hand expression if there is one.
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/// </summary>
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/// <param name="toConvert">the value to wrap in the Ref</param>
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/// <returns>the Ref wrapping the value</returns>
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public static implicit operator Ref<T>(T toConvert)
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{
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return new Ref<T>(toConvert);
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}
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/// <summary>
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/// Throws error if one was set.
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/// </summary>
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public void Verify()
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{
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if (Error != null) throw Error;
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}
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/// <inheritdoc />
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public int CompareTo(T other)
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{
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if (Value is IComparable<T> compare)
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return compare.CompareTo(other);
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return Equals(Value, other) ? 0 : -1;
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}
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/// <inheritdoc />
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public int CompareTo(Ref<T> other)
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{
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return CompareTo(other.Value);
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}
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}
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internal static class ExceptionUtilities
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{
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private static readonly FieldInfo StackTraceStringFi = typeof(Exception).GetField("_stackTraceString", BindingFlags.NonPublic | BindingFlags.Instance);
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private static readonly Type TraceFormatTi = Type.GetType("System.Diagnostics.StackTrace")?.GetNestedType("TraceFormat", BindingFlags.NonPublic);
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private static readonly MethodInfo TraceToStringMi = typeof(StackTrace).GetMethod("ToString", BindingFlags.NonPublic | BindingFlags.Instance, null, new[] { TraceFormatTi }, null);
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public static Exception SetStackTrace(this Exception target, StackTrace stack)
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{
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var getStackTraceString = TraceToStringMi.Invoke(stack, new[] { Enum.GetValues(TraceFormatTi).GetValue(0) });
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StackTraceStringFi.SetValue(target, getStackTraceString);
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return target;
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}
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}
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}
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