Added polyfill for System.Runtime.CompilerServices.OverloadResolution…

…PriorityAttribute type.

Documentation/Changelog.md

@@ -14,6 +14,7 @@ Release date: not released yet
 - Added `Gapotchenko.FX.IOptional` interface for `Gapotchenko.FX.Optional<T>` type to allow an untyped value introspection
 - Implemented memory span-based operations for `Gapotchenko.FX.IO.FragmentedMemoryStream`
 - Polyfills:
+    - Added polyfill for `System.Runtime.CompilerServices.OverloadResolutionPriorityAttribute` type
     - Added `Zip(first, second)` and `Zip(first, second, third)` polyfill methods for `IEnumerable<T>` type
 - Fixed issues:
     - Fixed issue with nested `Gapotchenko.FX.Optional<T>` values that could occur during implicit value conversion

Source/Modules/Catalog/Gapotchenko.FX/Runtime/CompilerServices/OverloadResolutionPriorityAttribute.cs

@@ -0,0 +1,44 @@
+#if !NET9_0_OR_GREATER
+
+#pragma warning disable IDE0130 // Namespace does not match folder structure
+
+namespace System.Runtime.CompilerServices;
+
+/// <summary>
+/// <para>
+/// Specifies the priority of a member in overload resolution.
+/// When unspecified, the default priority is <c>0</c>.
+/// </para>
+/// <para>
+/// This is a polyfill provided by Gapotchenko.FX.
+/// </para>
+/// </summary>
+[AttributeUsage(AttributeTargets.Constructor | AttributeTargets.Method | AttributeTargets.Property, AllowMultiple = false, Inherited = false)]
+public sealed class OverloadResolutionPriorityAttribute : Attribute
+{
+    /// <summary>
+    /// Initializes a new instance of the <see cref="OverloadResolutionPriorityAttribute"/> class.
+    /// </summary>
+    /// <param name="priority">
+    /// The priority of the attributed member.
+    /// Higher numbers are prioritized, lower numbers are deprioritized.
+    /// <c>0</c> is the default if no attribute is present.
+    /// </param>
+    public OverloadResolutionPriorityAttribute(int priority)
+    {
+        Priority = priority;
+    }
+
+    /// <summary>
+    /// The priority of the member.
+    /// </summary>
+    public int Priority { get; }
+}
+
+#else
+
+using System.Runtime.CompilerServices;
+
+[assembly: TypeForwardedTo(typeof(OverloadResolutionPriorityAttribute))]
+
+#endif