// defined from .NET Framework 4.5 and NETFX_CORE #if !(NETFX_CORE || NET_4_6 || NET_STANDARD_2_0 || UNITY_WSA_10_0) using System; namespace UniRx { public interface IProgress<T> { void Report(T value); } public class Progress<T> : IProgress<T> { readonly Action<T> report; public Progress(Action<T> report) { this.report = report; } public void Report(T value) { report(value); } } } #endif