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// This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
//
// Copyright (c) 2022 JP Bruyère
using System;
using System.Linq;
using System.Runtime.InteropServices;
namespace Vulkan
{
/// <summary>
/// Helper class to construct pnext chain
/// </summary>
public class PNext<T> : IDisposable where T : struct
{
IntPtr handle;
/// <summary>
/// Allocate on HGlobal a new structure of type T, ensure instance is Disposed.
/// </summary>
public PNext () {
init();
}
/// <summary>
/// Allocate on HGlobal a new structure of type T and set the pNext field,
/// ensure instance is Disposed.
/// </summary>
public PNext (IntPtr pNext) {
init();
Marshal.WriteIntPtr(handle + 4, pNext);
}
/// <summary>
/// Allocate on HGlobal a new structure of type T and set current value
/// ensure instance is Disposed.
/// </summary>
public PNext (T instance) {
handle = Marshal.AllocHGlobal(Marshal.SizeOf<T>());
Marshal.StructureToPtr(instance, handle, false);
}
/// <summary>
/// Allocate on HGlobal a new structure of type T set current value and
/// the PNext field.
/// ensure instance is Disposed.
/// </summary>
public PNext (T instance, IntPtr pNext) {
handle = Marshal.AllocHGlobal(Marshal.SizeOf<T>());
Marshal.StructureToPtr(instance, handle, false);
Marshal.WriteIntPtr(handle + 4, pNext);
}
void init() {
handle = Marshal.AllocHGlobal(Marshal.SizeOf<T>());
Type t = typeof(T);
StructureTypeAttribute st = (StructureTypeAttribute)t.GetCustomAttributes(typeof(StructureTypeAttribute), false).FirstOrDefault();
Marshal.WriteInt32(handle, st.StructureType);
}
/// <summary>
/// Get value of T
/// </summary>
public T Val => Marshal.PtrToStructure<T> (handle);
public static implicit operator IntPtr(PNext<T> pn) => pn.handle;
public void Dispose()
{
Marshal.FreeHGlobal(handle);
}
}
}
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