Pavel Kulyov
78862cfe4f
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36 lines
1.1 KiB
Scheme
36 lines
1.1 KiB
Scheme
;;; A module. Everything marked `pub' forms its public interface;
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;;; everything else is private to this file.
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;;;
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;;; Importing a module does not link it: it pastes the declarations, so
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;;; the compiled object still has to be handed to the C compiler. See
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;;; greet-app.sex.
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(include stdio.h)
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(pub var greet-count int 0)
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(pub struct greeting
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"A greeting to print."
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((text (* const char)) (times int)))
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(pub enum mood (cheerful grumpy))
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(pub typedef greeting-t (struct greeting))
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;;; Compile-time reflection across the module boundary: both the macro
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;;; and the struct it asks about are exported, and the importing unit
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;;; has to know the struct's fields to expand this.
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(pub defmacro (describe-fields type)
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`(do ,@(map-fields type
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(lambda (name field-type)
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`(printf "%s " ,(symbol->string name))))))
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(pub fn greet ((name (* const char))) void
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"Print a greeting for NAME."
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(++ greet-count)
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(printf "hello, %s\n" name))
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;;; Not `pub': invisible to importers, and static in the generated C.
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(fn unused-helper () void
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(printf "private\n"))
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