option-type

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Ant in Ant in Maven: How to add optional tasks?

I\'m trying to run junitreport task in Ant in Ant in Maven: <plugin> <groupId>org.apache.maven.plugins</groupId>[详细]

2023-04-12 19:18 分类：问答
string padded with optional blank with max length

I have a problem building a regex. this is a sample of the text: text 123 12345 abc 12def 67 i 89 o 0t 2[详细]

2023-04-12 16:29 分类：问答
iSynaptic.Commons and the Maybe Monad

I\'ve been trying to figure out how I could use the Maybe monad in iSynaptic.Commons in a context where my value retriever could throw an exception:[详细]

2023-04-10 11:16 分类：问答
Function Returns "No Solution" Instead Of "Nothing"

I have a standard datatype representing formulae of predicate logic. A function representing a natural deduction elimination rule for disjunction might look like:[详细]

2023-04-09 08:06 分类：问答
Shorter way to write this code

The following pattern appears very frequently in Haskell c开发者_如何学编程ode. Is there a shorter way to write it?[详细]

2023-04-05 07:10 分类：问答
Collapse option type creation

If I specify function value as: let applyFirst f elements = if Seq.isEmpty elements then None else elements |> Seq.head |> f[详细]

2023-04-04 05:21 分类：问答
How to set IDL, so users can tell a parameter is "optional" in VBA?

In an IDL, I define a method: [id(1), helpstring(\"BLAH\")] HRESULT SomeMeth开发者_如何学Pythonod([in, optional, defaultvalue(NULL)] IDispatch* para);[详细]

2023-03-31 08:05 分类：问答
Are there any conventions for printing optional values?

Suppose I want to overload operator<< for an optional<T> class t开发者_运维知识库emplate. How would I print the \"absent value\", and how would I print a \"real value\" x?[详细]

2023-03-26 19:23 分类：问答
Using Haskell's "Maybe", type declarations [beginner's question]

I\'ve started experimenting with Haskell and have a problem. qqq is a function that should print one string if called with \"Nothing\" and print other things if called with \"Just something\".[详细]

2023-03-20 14:01 分类：问答
'option<unit->unit> type and the equality' using F#

Consider th开发者_开发技巧e following code: let fnOption = Some (fun () -> ()) fnOption = None[详细]

2023-03-20 11:31 分类：问答