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POReusing units of measure across different types
 

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    <p><em>(<a href="https://stackoverflow.com/questions/460766/f-units-of-measure-problems-with-genericity">Yes</a>, <a href="https://stackoverflow.com/questions/490780/f-units-of-measure-problems-with-genericity-2">still</a> <a href="https://stackoverflow.com/questions/412459/how-to-generically-remove-f-units-of-measure">playing</a> <a href="https://stackoverflow.com/questions/419521/f-units-of-measure-lifting-values-to-floatsomething">with</a> <a href="https://stackoverflow.com/questions/348853/units-of-measure-in-c-almost">units</a> of <a href="https://stackoverflow.com/questions/1398611/f-ununit-reunit-inside-a-function">measure</a>)</em></p> <p>I've just started using units of measure for something other than float for the first time.</p> <p>After starting off complicated, I discovered that you can re-use units of measure across multiple 'types'.</p> <pre><code>[&lt;Measure&gt;] type mm let a = 1&lt;mm&gt; let b = 1.&lt;mm&gt; </code></pre> <p>Now I'm sitting here wondering how to update my existing mm type to reflect this possibility:</p> <pre><code>[&lt;Measure&gt;] type mm = static member perMetre = 1000.0&lt;mm/m&gt; static member fromMetre (v:float&lt;m&gt;) = v * mm.perMetre static member toMetre (v:float&lt;mm&gt;) = v / mm.perMetre static member lift (v:float) = v * 1.0&lt;mm&gt; </code></pre> <p><strong>The question:</strong> How do I write a function that can convert from <code>mm</code> to <code>m</code> (say) that can handle <code>int&lt;mm> -> int&lt;m></code> AND <code>float&lt;mm> -> float&lt;m></code>?</p> <p><strong>UPDATE</strong></p> <p>Thanks to Kurt, here's the new version:</p> <pre><code>[&lt;Measure&gt;] type mm = static member private perMetreFloat = 1000.0&lt;mm/m&gt; static member private perMetreInt = 1000&lt;mm/m&gt; [&lt;OverloadIDAttribute("float")&gt;] static member fromMetre (v:float&lt;m&gt;) = v * mm.perMetreFloat [&lt;OverloadIDAttribute("float")&gt;] static member toMetre (v:float&lt;mm&gt;) = v / mm.perMetreFloat [&lt;OverloadIDAttribute("float")&gt;] static member lift (v:float) = v * 1.0&lt;mm&gt; [&lt;OverloadIDAttribute("int")&gt;] static member fromMetre (v:int&lt;m&gt;) = v * mm.perMetreInt [&lt;OverloadIDAttribute("int")&gt;] static member toMetre (v:int&lt;mm&gt;) = v / mm.perMetreInt [&lt;OverloadIDAttribute("int")&gt;] static member lift (v:int) = v * 1&lt;mm&gt; </code></pre>
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