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最新推荐文章于 2021-12-22 12:48:17 发布

原创最新推荐文章于 2021-12-22 12:48:17 发布 · 746 阅读

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文章标签：

#primitive #scheme #function #integer #vector #object

本文介绍了Scheme中原始过程的概念及其创建方式。原始过程是一种用C语言实现的过程，通过scheme_make_prim_w_arity函数创建，并在MzScheme中调用。文章详细说明了创建原始过程所需的参数及其实现细节。

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A primitive procedure is a Scheme-callable procedure that is implemented in C. Primitive
procedures are created in MzScheme with the function scheme_make_prim_w_arity, which takes
a C function pointer, the name of the primitive, and information about the number of Scheme
arguments that it takes; it returns a Scheme procedure value.

The C function implementing the procedure must take two arguments: an integer that specifies
the number of arguments passed to the procedure, and an array of Scheme_Object * arguments.
The number of arguments passed to the function will be checked using the arity information.
The procedure implementation is not allowed to mutate the input array of arguments, although
it may mutate the arguments themselves when appropriate (e.g.,a fill in a vector argument).