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POAccessing let bound fields from static members
 

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    <p>Is there any way to access let bound fields from a static member? The following gives the indicated error:</p> <pre><code>type Foo(x) = let x = x static member test() = let foo = Foo(System.DateTime.Now.Month) printfn "%A" foo.x //the field, constructor or member 'x' is not defined () </code></pre> <p>Whereas private explicit fields do allow access from static members:</p> <pre><code>type Bar = val private x:int new(x) = { x=x } static member test() = let Bar = Bar(System.DateTime.Now.Month) printfn "%A" Bar.x () </code></pre> <p>The documentation <a href="http://msdn.microsoft.com/en-us/library/dd469494.aspx" rel="noreferrer">http://msdn.microsoft.com/en-us/library/dd469494.aspx</a> states that "Explicit fields are not intended for routine use," yet accessing private instance fields from static members is certainly a routine scenario. Moreover, I don't believe you can set explicit fields within a primary constructor, which means if even one private instance field needs to be accessed from a static member, all of your fields must be moved over to explicit fields and you can no longer use a primary constructor -- it's all or nothing.</p> <p>As real world example where you would actually want to access a private instance field from a static member, consider a big integer implementation: a BigInteger class would be immutable, so the internal representation of the big integer would kept as a private instance field (let's call it <code>data</code>). Now, suppose you felt an <code>Add(other)</code> instance method was inappropriate for an immutable data structure and you only wanted to implement a static <code>Add(lhs,rhs)</code> method: in this case, you would need to be able to access <code>lhs.data</code> and <code>rhs.data</code>.</p>
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