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2.1.2 Floating point types

The FLI provides several different immediate types for the representation of floating point numbers. They consist of the following: :float, :double, :lisp-double-float, :lisp-float, and :lisp-single-float. The floating types all associate equivalent Lisp and C types, except the :lisp-float, which can take a modifier to cause an associations between different floating types. A :lisp-float associates a Lisp float with a C float by default, but a declaration of (:lisp-float :double) corresponds to a C double , for example.

Note: be sure to use :language :ansi-c when passing float arguments to and from C using define-foreign-function and so on.


LispWorks Foreign Language Interface User Guide and Reference Manual - 7 Dec 2011

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