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using System;
using System.Diagnostics.CodeAnalysis;
using System.Runtime.CompilerServices;
namespace Ryujinx.Common.Memory
{
/// <summary>
/// Represents a pointer to an unmanaged resource.
/// </summary>
/// <typeparam name="T">Type of the unmanaged resource</typeparam>
public unsafe struct Ptr<T> : IEquatable<Ptr<T>> where T : unmanaged
{
private IntPtr _ptr;
/// <summary>
/// Null pointer.
/// </summary>
public static Ptr<T> Null => new() { _ptr = IntPtr.Zero };
/// <summary>
/// True if the pointer is null, false otherwise.
/// </summary>
public readonly bool IsNull => _ptr == IntPtr.Zero;
/// <summary>
/// Gets a reference to the value.
/// </summary>
public readonly ref T Value => ref Unsafe.AsRef<T>((void*)_ptr);
/// <summary>
/// Creates a new pointer to an unmanaged resource.
/// </summary>
/// <remarks>
/// For data on the heap, proper pinning is necessary during
/// use. Failure to do so will result in memory corruption and crashes.
/// </remarks>
/// <param name="value">Reference to the unmanaged resource</param>
public Ptr(ref T value)
{
_ptr = (IntPtr)Unsafe.AsPointer(ref value);
}
public readonly override bool Equals(object obj)
{
return obj is Ptr<T> other && Equals(other);
}
public readonly bool Equals([AllowNull] Ptr<T> other)
{
return _ptr == other._ptr;
}
public readonly override int GetHashCode()
{
return _ptr.GetHashCode();
}
public static bool operator ==(Ptr<T> left, Ptr<T> right)
{
return left.Equals(right);
}
public static bool operator !=(Ptr<T> left, Ptr<T> right)
{
return !(left == right);
}
}
}
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