/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Microsoft Public License. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Microsoft Public License, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Microsoft Public License.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
#if !SILVERLIGHT
#if !CLR2
using System.Linq.Expressions;
#else
using Microsoft.Scripting.Ast;
#endif
namespace Microsoft.Scripting.ComInterop{
/// <summary>
/// ArgBuilder provides an argument value used by the MethodBinder. One ArgBuilder exists for each
/// physical parameter defined on a method.
///
/// Contrast this with ParameterWrapper which represents the logical argument passed to the method.
/// </summary>
internal abstract class ArgBuilder {
/// <summary>
/// Provides the Expression which provides the value to be passed to the argument.
/// </summary>
internal abstract Expression Marshal(Expression parameter);
/// <summary>
/// Provides the Expression which provides the value to be passed to the argument.
/// This method is called when result is intended to be used ByRef.
/// </summary>
internal virtual Expression MarshalToRef(Expression parameter) {
return Marshal(parameter);
}
/// <summary>
/// Provides an Expression which will update the provided value after a call to the method.
/// May return null if no update is required.
/// </summary>
internal virtual Expression UnmarshalFromRef(Expression newValue) {
return newValue;
}
}
}
#endif
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