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POUse Object.factory without needing to cast to a specific type
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20451131
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2013-12-08T07:56:29.567
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2014-01-13T18:16:15.527
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text
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I'm trying to create a similar router to Rails ActionDispatch router, which allows you to define a route similar to <pre><code>map.get "/foo", :controller => "Foo", :action => "index" </code></pre> which will then route <code>GET /foo</code> to <code>FooController#index</code>. With this structure in place you can use methods like <pre><code>map.resources :foos </code></pre> which will call methods like <pre><code>map.get "/foo", :controller => "Foo", :action => "index" map.get "/foo/:id", :controller => "Foo", :action => "show" </code></pre> and so on. In D, I've been able to figure out a lot of the reflexive code required to make this work, but not all of it. In Ruby I can do: <pre><code>class Foo def bar "FOOO BAR!" end end f = Object.const_get("Foo") f.new.__send__(:bar) #=> "FOOO BAR!" </code></pre> Which I've tried to translate to <pre><code>module foo; import std.stdio; class Foo { void bar() { writeln("FOO BAR!"); } } void main() { auto foo = Object.factory("foo.Foo"); __traits(getMember, foo, "bar"); } </code></pre> But that doesn't work because the compiler doesn't know what type <code>foo</code> is, so the call to <code>#bar</code> fails during compile. Everywhere I've seen <code>Object.factory</code> used they cast it to a specific type, so <pre><code>module foo; import std.stdio; class Foo { void bar() { writeln("FOO BAR!"); } } void main() { auto foo = cast(Foo) Object.factory("foo.Foo"); __traits(getMember, foo, "bar"); } </code></pre> would work just fine. But if I know what I want to cast the object to what good is using <code>Object.factory</code>? That doesn't make any sense to me! UPDATE 2 I've fixed compiler issues, but now it's crashing at runtime, saying it couldn't find the method <pre><code>module foo; import std.stdio; class MyDynamic { void call(C, T...)(C instance, string method, T args) { foreach(member; __traits(allMembers, C)) { writeln(member); if (member == method) { static if (__traits(compiles, __traits(getMember, instance, member)(args))) { __traits(getMember, instance, member)(args); } return; } } assert(0, "No method found"); } } class Foo : MyDynamic { void bar() { writeln("FOO BAR!"); } } void main() { auto foo = cast(MyDynamic) Object.factory("foo.Foo"); assert(foo !is null); foo.call(foo, "bar"); } </code></pre> Update For anyone coming to this question now, you can see my final solution here: <a href="https://github.com/jaredonline/action-pack" rel="nofollow">https://github.com/jaredonline/action-pack</a>
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Use Object.factory without needing to cast to a specific type
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1. PO
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1. USjaredonline
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1. USjaredonline
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