protected override void OnExecute(Tangle <T> tangle, out NoneType result)
{
var keys = Keys;
var count = GetCountFast(Keys);
if (!count.HasValue)
{
var array = Keys.ToArray();
keys = array;
count = array.Length;
}
Parallel.ForEach(
keys, (rawKey) => {
T value;
if (tangle.InternalGet(KeyConverter(rawKey), out value))
{
Function(rawKey, value);
}
}
);
result = NoneType.None;
}
public static Option <R> Map <T, R>
(this NoneType _, Func <T, R> f)
=> None;
public override object Visit(NoneType that, object value)
{
var result = (System.Text.StringBuilder) value;
result.Append('n'); // 'n' for none.
return null;
}
/// <summary>
/// Creates an optional value whose state is unset.
/// </summary>
public Optional(NoneType none)
{
_value = default(T);
_isSet = false;
}
public override object Visit(NoneType that, object value)
{
_writer.Write("none");
return null;
}
public override object Visit(NoneType that, object value = null)
{
PrintPrologue(that);
_writer.WriteLine("TypeKind = {0}", that.TypeKind.ToString());
PrintEpilogue(that);
return null;
}
public Node(NoneType type, UInt32 x, UInt32 y)
{
Type = type;
X = x;
Y = y;
}
public override object Visit(NoneType that, object value = null)
{
return null;
}
/** Parses a profile aka a parameter list and the optional return type. */
private Profile ParseProfile()
{
Token start = _matcher.Match(TokenKind.ParenthesisBegin);
// parse parameter list
var parameters = new List<Parameter>();
while (_matcher.This.Kind != TokenKind.ParenthesisClose)
{
Parameter parameter = ParseParameter();
parameters.Add(parameter);
if (_matcher.This.Kind != TokenKind.Comma)
break;
_matcher.Match(TokenKind.Comma);
_matcher.Match(TokenKind.Space);
}
_matcher.Match(TokenKind.ParenthesisClose);
// Parse optional return type.
Type type;
if (_matcher.This.Kind == TokenKind.Colon)
type = new NoneType(_matcher.This.Cursor);
else
{
_matcher.Match(TokenKind.Space);
_matcher.Match(TokenKind.Keyword_Is);
_matcher.Match(TokenKind.Space);
type = ParseType();
}
return new Profile(start.Cursor, type, parameters.ToArray());
}
public virtual object Visit(NoneType that, object value)
{
throw new System.NotImplementedException();
}