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POGetting rid of function's argument
 

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  1. POGetting rid of function's argument
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    <p>It is better to explain my intention with code. So right now I have the following code:</p> <pre><code>class A, IInterfaceUsedByB { } class B { void func(A someObject) { func2(someObject, 1); func3(someObject, "string"); func4(someObject, new MyObject()); var anotherObject = someObject.NewInstance; func2(anotherObject, 1); ....................... } func2(A someObject, int val); func3(A someObject, string val); func4(A someObject, C val); } </code></pre> <p>Where <code>func2</code>, <code>func3</code>, <code>func4</code> do need references to someObject. I want to change this to</p> <pre><code>void func(A someObject) { with(someObject, () =&gt; { func2(1); func3("string"); func4(new MyObject()); } ); var anotherObject = someObject.NewInstance; with(anotherObject, () =&gt; { func2(1); ....................... } ); } </code></pre> <p>Or even better to</p> <pre><code>void func(A someObject) { func2(1); func3("string"); func4(new MyObject()); } </code></pre> <p>So that I don't have to drag this someObject around, but I should still be able to use it inside func2,3,4. In other words it's like setting some context object for a particular code block. I can use any of the three languages (C#, F# or IronPython) for this.</p> <p><strong>UPDATE</strong> In the ideal solution class B would be independent of A. <code>func*</code> functions only depend on a small interface of A consisting of 2 methods.</p> <p><strong>UPDATE2</strong> The someObject can be different for different function calls.</p> <p><strong>UPDATE3</strong> I don't think that there's a way to do this only with language primitives like classes, interfaces or extension methods. I think that the solution might be possible with more hackish tools, like attributes, reflection or F#'s computation workflow feature. Or maybe some dynamic features of IronPython. Essentially what I'm trying to do is to create a small embedded DSL.</p>
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    1. COSounds like you're looking for a global variable?
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      1. POGetting rid of function's argument
      1. USCameron
    2. COIn addition to the above two comments/options, perhaps you can use something like Partial Function Application or Currying: http://msmvps.com/blogs/jon_skeet/archive/2012/01/30/currying-vs-partial-function-application.aspx
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      1. POGetting rid of function's argument
      1. USChris Sinclair
    3. CO@rid `func*` are already methods of another class. Ideally someObject and the class of `func*` should be independent of each other so I can easily replace someObject with another class without changing `func*`s class
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