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POOverloading external function for use in a separate module
 

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    <p>I want to do <a href="http://www.drdobbs.com/cpp/uniform-function-call-syntax/232700394" rel="nofollow">this</a> (supported by <a href="http://www.drdobbs.com/cpp/how-non-member-functions-improve-encapsu/184401197" rel="nofollow">this</a>), but I'm hitting a tiny issue (watered down for your less-headachy-non-displeasure).</p> <p>Let's say I'm a library writer, and I have these functions in a D file:</p> <pre><code>module mod_a; import std.stdio; void run(T)(T v) { writeln("Jigglypuff!"); } void runrun(T)(T v) { run(v); } </code></pre> <p>And I have client code in another module in which I attempt to overload <code>run</code> and call <code>runrun</code>:</p> <pre><code>import mod_a; void run(T:double)(T v) { writeln("Wigglytuff!"); } void main() { runrun(1.0); } </code></pre> <p>This code results in 'Jigglypuff!' being printed rather than 'Wigglytuff!', which makes sense, because the definition of <code>runrun</code> can only see the <s>unevolved</s> unspecialized form available to it in its module. I (and client code), however, would like to be seeing a 'Wigglytuff' rather than a 'Jigglypuff'.</p> <p>In C++ I'd throw a <code>namespace mod_a { ... }</code> around the specialization of run to show that the client code's run should be examined alongside my library code when trying to determine what the definition of <code>runrun</code> calls, welcoming the can of worms that came along with such behavior.</p> <p>Is there an idiomatic D-way to organize this such that the function <code>run</code> may be <em>intentionally</em> hijacked? Specifically, I'd like to mimic the way C++'s global functions behave with ad-hoc specializations.</p>
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    1. COYour second `run(T)` does not overload `mod_a.run(T)` at all, you're not in the same module.
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    2. CO@Kris Yes, you're right. I was abusing terminology. The intention is for the answer to show me how I'd shove it into the set of overloads the compiler checks for when examining `runrun`.
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    3. COmy comment was to meant to indicate why that doesn't (and shouldn't work, according to http://dlang.org/hijack.html). I don't think your use of terminology was wrong in any way.
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