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some syntactical ideas for C#
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class Example | |
{ | |
// "init-anywhere" syntax (along the lines of Haskell) | |
[Implemented(true)] | |
Foo Do() | |
{ | |
var x = new Foo { bar = 1 }; // <- currently available | |
return x { bar = 3 }; // <- proposed (note that this mutates unlike Haskell) | |
} | |
[Implemented(true)] | |
Foo Also() | |
{ | |
var x = new Foo { bar = 1 }; | |
// this could be used akin to VB 'with' ;) | |
x { | |
bar = 2, | |
baz = 3, | |
}; | |
return x; | |
} | |
// And for Java-parity: | |
// - reuse keyword 'where' to do anonymous inner classes (it's needed to disambig) | |
public void YEAH() | |
{ | |
var x = new Foo { bar = 1 } | |
where | |
{ | |
public override string ToString() | |
{ | |
Console.WriteLine("HAHA!"); | |
} | |
}; | |
} | |
// without 'where' there'd some some ambiguity when parsing collection initializers | |
List<int> DisambigRequired() | |
{ | |
// also, methods should default to "public" inside wheres | |
// not private! | |
return new List<int> where { int Length { return Count; } } | |
} | |
// also implement new interfaces | |
IDisposable Whatever() | |
{ | |
// how about: | |
return new List<int> where IDisposable { void Dispose() { Console.WriteLine("Disposed"); } } | |
} | |
// combine these features: | |
void FairlyTerribleCode<T>() | |
{ | |
var magicList = new List<T> where { | |
List<T> GetValueOrDefault(T elseWise) | |
{ | |
if (Count == 0) Add(elseWise); | |
return this; | |
} | |
} | |
var stupidity = (magicList ?? default(T)).First(); | |
} | |
// tuple unpacking | |
void EveryoneKnowsThisAlready() | |
{ | |
var (x, y, z) = Tuple.Create(1, 2, 3); | |
// expands to: | |
var tmp = Tuple.Create(1, 2, 3); | |
var x = tmp.Item1; | |
var y = tmp.Item2; | |
var z = tmp.Item3; | |
} | |
// tuple syntax | |
[Implemented(true)] | |
void ALaPython() | |
{ | |
var x = (1, 2, 3); | |
var y = (1, 2); | |
var z = (1,); | |
} | |
// and in return types: | |
[Implemented(true)] | |
(int, string) Foo() | |
{ | |
return (1, "hello"); | |
} | |
/* and a few more items; */ | |
void Misc() | |
{ | |
// default-assign operator | |
int? x = null; | |
x ??= 2; | |
// binary literals | |
var n = 0b1010; | |
} | |
} |
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