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| 1 | +// |
| 2 | +// Copyright (c) .NET Foundation and Contributors |
| 3 | +// Portions Copyright (c) Microsoft Corporation. All rights reserved. |
| 4 | +// See LICENSE file in the project root for full license information. |
| 5 | +// |
| 6 | + |
| 7 | +namespace System |
| 8 | +{ |
| 9 | + using System.Runtime.CompilerServices; |
| 10 | + |
| 11 | + /// <summary> |
| 12 | + /// Encapsulates a method that has no parameters and does not return a value. |
| 13 | + /// </summary> |
| 14 | + public delegate void Action(); |
| 15 | + |
| 16 | + /// <summary> |
| 17 | + /// Encapsulates a method that has a single parameter and does not return a value. |
| 18 | + /// </summary> |
| 19 | + /// <typeparam name="T">The type of the parameter of the method that this delegate encapsulates. |
| 20 | + /// This type parameter is covariant.That is, you can use either the type you specified or any type that is more derived.For more information about covariance and contravariance, see <see href="https://docs.microsoft.com/en-us/dotnet/standard/generics/covariance-and-contravariance">Covariance and Contravariance in Generics</see>.</typeparam> |
| 21 | + /// <param name="obj">The parameter of the method that this delegate encapsulates.</param> |
| 22 | + public delegate void Action<in T>(T obj); |
| 23 | + |
| 24 | + /// <summary> |
| 25 | + /// Encapsulates a method that has a single parameter and does not return a value. |
| 26 | + /// </summary> |
| 27 | + /// <typeparam name="T1">The type of the first parameter of the method that this delegate encapsulates. |
| 28 | + /// This type parameter is covariant.That is, you can use either the type you specified or any type that is more derived.For more information about covariance and contravariance, see <see href="https://docs.microsoft.com/en-us/dotnet/standard/generics/covariance-and-contravariance">Covariance and Contravariance in Generics</see>.</typeparam> |
| 29 | + /// <typeparam name="T2">The type of the second parameter of the method that this delegate encapsulates. |
| 30 | + /// This type parameter is covariant.That is, you can use either the type you specified or any type that is more derived.For more information about covariance and contravariance, see <see href="https://docs.microsoft.com/en-us/dotnet/standard/generics/covariance-and-contravariance">Covariance and Contravariance in Generics</see>.</typeparam> |
| 31 | + /// <param name="arg1">The first parameter of the method that this delegate encapsulates.</param> |
| 32 | + /// <param name="arg2">The second parameter of the method that this delegate encapsulates.</param> |
| 33 | + public delegate void Action<in T1, in T2>(T1 arg1, T2 arg2); |
| 34 | + |
| 35 | + /// <summary> |
| 36 | + /// Encapsulates a method that has no parameters and returns a value of the type specified by the <typeparamref name="TResult"/> parameter. |
| 37 | + /// </summary> |
| 38 | + /// <typeparam name="TResult">The type of the return value of the method that this delegate encapsulates. |
| 39 | + /// This type parameter is covariant.That is, you can use either the type you specified or any type that is more derived.For more information about covariance and contravariance, see <see href="https://docs.microsoft.com/en-us/dotnet/standard/generics/covariance-and-contravariance">Covariance and Contravariance in Generics</see>.</typeparam> |
| 40 | + /// <returns>The return value of the method that this delegate encapsulates.</returns> |
| 41 | + public delegate TResult Func<out TResult>(); |
| 42 | + |
| 43 | + /// <summary> |
| 44 | + /// Encapsulates a method that has one parameter and returns a value of the type specified by the <typeparamref name="TResult"/> parameter. |
| 45 | + /// </summary> |
| 46 | + /// <typeparam name="T">The type of the parameter of the method that this delegate encapsulates. |
| 47 | + /// This type parameter is covariant.That is, you can use either the type you specified or any type that is more derived.For more information about covariance and contravariance, see <see href="https://docs.microsoft.com/en-us/dotnet/standard/generics/covariance-and-contravariance">Covariance and Contravariance in Generics</see>.</typeparam> |
| 48 | + /// <typeparam name="TResult">The type of the return value of the method that this delegate encapsulates. |
| 49 | + /// This type parameter is covariant.That is, you can use either the type you specified or any type that is more derived.For more information about covariance and contravariance, see <see href="https://docs.microsoft.com/en-us/dotnet/standard/generics/covariance-and-contravariance">Covariance and Contravariance in Generics</see>.</typeparam> |
| 50 | + /// <param name="arg">The parameter of the method that this delegate encapsulates.</param> |
| 51 | + /// <returns>The return value of the method that this delegate encapsulates.</returns> |
| 52 | + public delegate TResult Func<in T, out TResult>(T arg); |
| 53 | + |
| 54 | + /// <summary> |
| 55 | + /// Encapsulates a method that has one parameter and returns a value of the type specified by the <typeparamref name="TResult"/> parameter. |
| 56 | + /// </summary> |
| 57 | + /// <typeparam name="T1">The type of the parameter of the method that this delegate encapsulates.</typeparam> |
| 58 | + /// <typeparam name="T2">The type of the parameter of the method that this delegate encapsulates.</typeparam> |
| 59 | + /// <typeparam name="TResult">The type of the return value of the method that this delegate encapsulates. |
| 60 | + /// This type parameter is covariant.That is, you can use either the type you specified or any type that is more derived.For more information about covariance and contravariance, see <see href="https://docs.microsoft.com/en-us/dotnet/standard/generics/covariance-and-contravariance">Covariance and Contravariance in Generics</see>.</typeparam> |
| 61 | + /// <param name="arg1">The first parameter of the method that this delegate encapsulates.</param> |
| 62 | + /// <param name="arg2">The second parameter of the method that this delegate encapsulates.</param> |
| 63 | + /// <returns>The return value of the method that this delegate encapsulates.</returns> |
| 64 | + public delegate TResult Func<in T1, in T2, out TResult>(T1 arg1, T2 arg2); |
| 65 | +} |
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