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POf# Statically resolved types in type members
 

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    <p>I want to implement <code>IEnumerable&lt;KeyValuePair&lt;DateTime, 'T&gt;&gt;</code> in my own class and add math operators to that class so that the operators could work like inline function on any numeric types of <code>'T</code> - automatically add constraints.</p> <p>I just cannot make the following piece of code work. It doesn't work neither with nor without 'inline' keyword at the member declaration.</p> <p>Also, if I define a function</p> <pre><code>let inline add l r = l + r </code></pre> <p>before the type and use it instead of addition l.Value + r.Value, it also doesn't work.</p> <p>Could someone please show me what I am doing wrong?</p> <p>Probably the whole approach is wrong and there is a way to achieve the same goal the other way?</p> <pre><code>namespace Test open System open System.Linq open System.Collections.Generic [&lt;SerializableAttribute&gt;] type TimeSeries&lt;'T&gt;(dictionary : IDictionary&lt;DateTime, 'T&gt;) = let internalList = new SortedList&lt;DateTime, 'T&gt;(dictionary) interface IEnumerable&lt;KeyValuePair&lt;DateTime, 'T&gt;&gt; with member this.GetEnumerator() = internalList.GetEnumerator() member this.GetEnumerator() : Collections.IEnumerator = internalList.GetEnumerator() :&gt; Collections.IEnumerator member private this.sl = internalList static member inline (+) (left : TimeSeries&lt;'T&gt;, right : TimeSeries&lt;'T&gt;) = let res = query { for l in left do join r in right on (l.Key = r.Key) select (l.Key, l.Value + r.Value) } new TimeSeries&lt;'T&gt;(res |&gt; dict) </code></pre>
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    1. USGustavo
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    1. COHere's the simplest answer to the question I know of: http://tomasp.net/blog/fsharp-generic-numeric.aspx Complicated subject.
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      1. USCraig Stuntz
 

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