|
public static ArgumentNullException ( IEnumerable |
||
| parameters | IEnumerable |
|
| return | IEnumerable |
|
void AddCreatorDocs(CodeTypeDeclaration type, CodeMemberMethod method, int w, int n)
{
var tp = Types.GetTypeParameter(w, n);
var idx = XmlDocs.GetIndex(tp);
var fold = type.GetMethods("Fold").First();
method.Comments.AddDocs(
XmlDocs.Param("value",
" A <typeparamref name=\"" + tp + "\" /> containing the value",
" to provide to the " + idx,
" " + XmlDocs.See(DefaultNamespace, type, fold),
" delegate."
),
XmlDocs.Summary(
" Creates a " + XmlDocs.See(DefaultNamespace, type) + " instance which",
" holds a <typeparamref name=\"" + tp + "\" /> value."
),
XmlDocs.Returns(
" A " + XmlDocs.See(DefaultNamespace, type) + " instance which holds a ",
" holds a <typeparamref name=\"" + tp + "\" /> value."
),
XmlDocs.Remarks(
" <para>",
" When",
" " + XmlDocs.See(DefaultNamespace, type, fold),
" is invoked,",
" the returned " + XmlDocs.See(DefaultNamespace, type) + " instance",
" will invoke the " + idx + " delegate",
" for conversions.",
" </para>"
),
XmlDocs.ArgumentNullException("value")
);
}
void AddFoldDocs(CodeTypeDeclaration type, CodeMemberMethod method, int n)
{
method.Comments.AddDocs(
XmlDocs.TypeParam("TResult",
" The type to convert the " + XmlDocs.See(DefaultNamespace, type) + " to."
),
GetFoldParametersDocs(type, n),
XmlDocs.Summary(
" Converts a " + XmlDocs.See(DefaultNamespace, type) + " into a <typeparamref name=\"TResult\" /> value."
),
XmlDocs.Returns(
" A <typeparamref name=\"TResult\" /> as generated by one",
" of the conversion delegate parameters."
),
XmlDocs.Remarks(
" <para>",
" Converts a " + XmlDocs.See(DefaultNamespace, type) + " into a <typeparamref name=\"TResult\" />",
" by invoking one of the provided delegate parameters.",
" </para>",
" <para>",
" The parameter which is invoked is predicated upon the internal position of",
" the value held. For example, if the internal value is in the first position ",
" (i.e. " + XmlDocs.See(DefaultNamespace, type, type.GetMethods(A(0)).First()),
" was used to create the " + XmlDocs.See(DefaultNamespace, type) + " instance), then",
" <paramref name=\"a\" /> (the first delegate parameter) will be invoked to",
" convert the <typeparamref name=\"T1\" /> into a ",
" <typeparamref name=\"TResult\" />.",
" </para>"
),
XmlDocs.ArgumentNullException(Enumerable.Range(0, n).Select(v => a(v)))
);
}
static CodeMemberMethod RecFunc(int args)
{
var t = Types.Func(args);
var m = new CodeMemberMethod()
{
Attributes = MemberAttributes.Static | MemberAttributes.Public,
Name = "RecFunc",
ReturnType = t,
};
m.TypeParameters.AddRange(Types.GetTypeParameters(args, true).ToArray());
var a = "lambda";
m.Parameters.Add(new CodeParameterDeclarationExpression(new CodeTypeReference("Func", t, t), a));
m.Statements.ThrowWhenArgumentIsNull(a);
var expr = AppendArgs(new StringBuilder(), args);
expr.Append(" => lambda (RecFunc (lambda))");
AppendArgs(expr, args);
m.Statements.Add(new CodeMethodReturnStatement(new CodeSnippetExpression(expr.ToString())));
m.Comments.AddRange("From: http://blogs.msdn.com/madst/archive/2007/05/11/recursive-lambda-expressions.aspx");
m.Comments.AddDocs(
XmlDocs.TypeParams(m.TypeParameters, t),
XmlDocs.Param("lambda", "The " + XmlDocs.See(t) + " to use."),
XmlDocs.Summary("Creates a " + XmlDocs.See(t) + " delegate, which may be recursive."),
XmlDocs.Returns("Returns a " + XmlDocs.See(t) + " which (eventually) invokes <paramref name=\"lambda\"/>."),
XmlDocs.ArgumentNullException("lambda"),
XmlDocs.Remarks(
"<para>",
" The following example makes use of a recursive lambda:",
"</para>",
"<code lang=\"C#\">",
" Func<int, int> factorial = Lambda.RecFunc<int, int> (".Replace("<", "<"),
" fac => x => x == 0 ? 1 : x * fac (x-1));",
" Console.WriteLine (factorial (5)); // prints \"120\"",
"</code>"
)
);
return(m);
}