using System;
using System.Runtime.ConstrainedExecution;
using System.Runtime.InteropServices;

namespace Foodsoft.Alpm
{
    internal abstract class SafePackageHandle : SafeHandle
    {
        protected SafePackageHandle(SafeAlpmHandle safeAlpmHandle) : base(IntPtr.Zero, true)
        {
            SafeAlpmHandle = safeAlpmHandle;
        }

        internal SafeAlpmHandle SafeAlpmHandle
        {
            [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
            [PrePrepareMethod]
            get;
        }

        public override bool IsInvalid
        {
            [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
            [PrePrepareMethod]
            get => handle == IntPtr.Zero;
        }
    }
}