C ++中的动态源代码 [英] Dynamic source code in C++

问题描述

如何在C ++中处理动态源代码？是否可以使用像eval（foo）？

How to process dynamic source code in C++? Is it possible to use something like eval("foo")?

我有一些函数需要根据用户的选择来调用：

I have some functions that need to be called depending on user's choice:

     void function1 ();
     void function2 ();
     ...
     void functionN ();

     int main (int argv, char * argv [])
     {
         char * myString = new char [100];
         ...
         myString = "1" //user input            
         cout << eval("function"+myString)();
     }

通常如何做？

UPD ：根据slacy和clinisbut的答案，我想我需要做一个函数注册表。我想它应该作为一个指针数组的函数。这里的问题是，如何声明一个函数指针数组？

UPD: Based on slacy's and clinisbut's answers I think I need to make a function registry. I suppose it should be made as an array of pointers to functions. Here's the question, how do I declare an array of pointers to functions?

推荐答案

C ++是一种编译语言，因此，

C++ is a compiled language, and thus, there is no equivalent to "eval()".

对于您提到的具体示例，您可以创建一个将输入（字符串）映射到输出（函数指针）的函数注册表，然后调用结果函数。

For the specific example you mention, you could make a function registry that maps inputs (strings) to outputs (function pointers) and then call the resultant function.

有几个C ++解释库可用，虽然性能会很差，他们可能会完成你想要的。 Google搜索C ++ interpreter。我看到了有关 Ch ， CINT 和clipp

There are several C++ interpreter libraries that are available, although performance will be very poor, they may accomplish what you want. Google search for "C++ interpreter". I've seen results for "Ch", "CINT" and "clipp"

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