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using System;
using System.Diagnostics;
using System.Reflection;
namespace IPA.Utilities
{
/// <summary>
/// A class to store a reference for passing to methods which cannot take ref parameters.
/// </summary>
/// <typeparam name="T">the type of the value</typeparam>
public class Ref<T>
{
private T _value;
/// <summary>
/// The value of the reference
/// </summary>
public T Value
{
get
{
if (Error != null) throw Error;
return _value;
}
set => _value = value;
}
private Exception _error;
/// <summary>
/// An exception that was generated while creating the value.
/// </summary>
public Exception Error
{
get
{
return _error;
}
set
{
value.SetStackTrace(new StackTrace(1));
_error = value;
}
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="reference">the initial value of the reference</param>
public Ref(T reference)
{
_value = reference;
}
/// <summary>
/// Throws error if one was set.
/// </summary>
public void Verify()
{
if (Error != null) throw new Exception("Found error", Error);
}
}
internal static class ExceptionUtilities
{
private static readonly FieldInfo StackTraceStringFi = typeof(Exception).GetField("_stackTraceString", BindingFlags.NonPublic | BindingFlags.Instance);
private static readonly Type TraceFormatTi = Type.GetType("System.Diagnostics.StackTrace")?.GetNestedType("TraceFormat", BindingFlags.NonPublic);
private static readonly MethodInfo TraceToStringMi = typeof(StackTrace).GetMethod("ToString", BindingFlags.NonPublic | BindingFlags.Instance, null, new[] { TraceFormatTi }, null);
public static Exception SetStackTrace(this Exception target, StackTrace stack)
{
var getStackTraceString = TraceToStringMi.Invoke(stack, new[] { Enum.GetValues(TraceFormatTi).GetValue(0) });
StackTraceStringFi.SetValue(target, getStackTraceString);
return target;
}
}
}