ILSpy/ICSharpCode.Decompiler/TypeSystem/IParameter.cs

// Copyright (c) 2010-2013 AlphaSierraPapa for the SharpDevelop Team
// 
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// 
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// substantial portions of the Software.
// 
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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using System.Runtime.CompilerServices;
using System.Collections.Generic;

namespace ICSharpCode.Decompiler.TypeSystem
{
	public interface IParameter : IVariable
	{
		/// <summary>
		/// Gets the attributes on this parameter.
		/// </summary>
		IEnumerable<IAttribute> GetAttributes();
		
		/// <summary>
		/// Gets whether this parameter is a C# 'ref' parameter.
		/// </summary>
		bool IsRef { get; }
		
		/// <summary>
		/// Gets whether this parameter is a C# 'out' parameter.
		/// </summary>
		bool IsOut { get; }

		/// <summary>
		/// Gets whether this parameter is a C# 'in' parameter.
		/// </summary>
		bool IsIn { get; }

		/// <summary>
		/// Gets whether this parameter is a C# 'params' parameter.
		/// </summary>
		bool IsParams { get; }

		/// <summary>
		/// Gets whether this parameter is optional.
		/// The default value is given by the <see cref="IVariable.GetConstantValue"/> function.
		/// </summary>
		bool IsOptional { get; }
		
		/// <summary>
		/// Gets whether this parameter has a constant value when presented in method signature.
		/// </summary>
		/// <remarks>
		/// This can only be <c>true</c> if the parameter is optional, and it's true for most 
		/// optional parameters. However it is possible to compile a parameter without a default value,
		/// and some parameters handle their default values in an special way.
		/// 
		/// For example, <see cref="DecimalConstantAttribute"/> does not use normal constants,
		/// so when <see cref="DecompilerSettings.DecimalConstants" /> is <c>false</c>
		/// we expose <c>DecimalConstantAttribute</c> directly instead of a constant value.
		/// 
		/// On the call sites, though, we can still use the value inferred from the attribute.
		/// </remarks>
		bool HasConstantValueInSignature { get; }
		
		/// <summary>
		/// Gets the owner of this parameter.
		/// May return null; for example when parameters belong to lambdas or anonymous methods.
		/// </summary>
		IParameterizedMember Owner { get; }
	}
}