调用OCaml中其他文件中的函数 [英] Calling functions in other files in OCaml

问题描述

我有具有长度函数的hello.ml:

I have hello.ml that has a length function:

let rec length l = 
    match l with
        [] -> 0
    | h::t -> 1 + length t ;;

使用功能的

call.ml:

call.ml that uses the function:

#use "hello.ml" ;; 

print_int (length [1;2;4;5;6;7]) ;;

在解释器模式(ocaml)中，我可以使用ocaml call.ml来获取结果，但是当我尝试使用ocamlc或ocamlbuild对其进行编译时，出现了编译错误.

In interpreter mode (ocaml), I can use ocaml call.ml to get the results, but when I tried to compile it with ocamlc or ocamlbuild, I got compilation error.

File "call.ml", line 1, characters 0-1:
Error: Syntax error

然后，如何修改调用方，被调用方和构建命令以将代码编译为可执行文件?

Then, how to modify the caller, callee, and build command to compile the code into executables?

推荐答案

#use指令仅在顶级(解释器)中有效.在已编译的代码中，您应该使用模块名称:Hello.length.

The #use directive only works in the toplevel (the interpreter). In compiled code you should use the module name: Hello.length.

我将展示如何从类似Unix的命令行构建程序.您必须将其适应您的环境:

I'll show how to build the program from a Unix-like command line. You'll have to adapt this to your environment:

$ ocamlc -o call hello.ml call.ml
$ ./call
6

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