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Updated Specter's inline caching implementation (markdown)

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Nathan Marz 2016-09-04 11:25:06 -04:00
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Specter's-inline-caching-implementation.md
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@ -64,13 +64,13 @@ The first example shows how sequential static navigators get precompiled togethe
The last example shows what Specter does when it has a local variable in the position of a navigator. Since Specter does not know if `b` is an implementation of `RichNavigator`, it cannot put it into a `comp-navs` call directly. `b` could be an implicit navigator like `:some-keyword`, or it could be an uncompiled path like `[ALL even?]`. So it inserts the call to `coerce-nav` to determine that at runtime. If you know for sure a symbol or form will create a `RichNavigator` object, then you can annotate it with metadata like this: The last example shows what Specter does when it has a local variable in the position of a navigator. Since Specter does not know if `b` is an implementation of `RichNavigator`, it cannot put it into a `comp-navs` call directly. `b` could be an implicit navigator like `:some-keyword`, or it could be an uncompiled path like `[ALL even?]`. So it inserts the call to `coerce-nav` to determine that at runtime. If you know for sure a symbol or form will create a `RichNavigator` object, then you can annotate it with metadata like this:
``` ```clojure
[:a ^:direct-nav b :c] => (comp-navs <ANON> b <ANON>) [:a ^:direct-nav b :c] => (comp-navs <ANON> b <ANON>)
``` ```
The same thing works for dynamic var references and special forms: The same thing works for dynamic var references and special forms:
``` ```clojure
[*a-dynamic-var*] => (coerce-nav *a-dynamic-*var) [*a-dynamic-var*] => (coerce-nav *a-dynamic-*var)
[^:direct-nav *a-dynamic-var*] => *a-dynamic-*var [^:direct-nav *a-dynamic-var*] => *a-dynamic-*var