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using System;

using System.Linq;

using System.Reflection;

using System.Reflection.Emit;

namespace Python.Runtime

{

internal static class ReflectionPolyfills

{

public static AssemblyBuilder DefineDynamicAssembly(this AppDomain _, AssemblyName assemblyName, AssemblyBuilderAccess assemblyBuilderAccess)

{

return AssemblyBuilder.DefineDynamicAssembly(assemblyName, assemblyBuilderAccess);

}

public static Type CreateType(this TypeBuilder typeBuilder)

{

return typeBuilder.CreateTypeInfo()!;

}

public static T GetCustomAttribute<T>(this Type type) where T: Attribute

{

return type.GetCustomAttributes(typeof(T), inherit: false)

.Cast<T>()

.SingleOrDefault();

}

public static T GetCustomAttribute<T>(this Assembly assembly) where T: Attribute

{

return assembly.GetCustomAttributes(typeof(T), inherit: false)

.Cast<T>()

.SingleOrDefault();

}

public static bool IsFlagsEnum(this Type type)

=> type.GetCustomAttribute<FlagsAttribute>() is not null;

}

}