How do I send or save a function and recv or restore a function and execute it in C++?

问题

Is there any way I can send or save a function as file? I want to do this in C++ on a Windows platform.

I assume that there is some convention between reader and sender or saver

Is it OK if I send like below? server side:

label1:
int func1(int somevar){
    int a = 1;
    return somevar+a;
}
label2:

send(sockfd, label2-label1, sizeof(int), 0) //send a size first
send(sockfd, label1, label2-label1, 0); // send a "function"

thanks in advance!

回答1:

No, there's no way to do that in C++. Languages which could allow transfer of executable code include Erlang, Ruby, TCL.

Chris

回答2:

There already exists a mechanism for this in windows for C++. Your functions are "saved" when compiling in a dll. You can then "retrieve" your functions from the dll using GetProcAddress().

回答3:

With C++ this is definitely not possible.

You could send a precompiled dynamically linked library containing the functions and load and execeute them at the end point.

回答4:

C++ is a static language - you can't modify the executable you're running and add in new functions. Languages like Ruby would allow you to do this, but its just not a feature of C++.

You could, if really really needed, possibly put your function in a file, send it over the network, and have your program on the other end compile the file and run it with a popen from your process or something... but that's getting pretty ridiculous by that point.

I'd say redesign so you don't need this.

回答5:

YOU CAN DO IT! Just write your own compiler that instead of compiling files, it waits for signals, builds files, and then compiles them. And then possibly runs them.

Basically:

send function text
receive function text
compile with your program the text
execute the compiled code
???
profit!

回答6:

No, that's not at all valid. That's basically quite impossible- you would need to use some sort of intermediary language or express the function in assembly or disassemble the resulting binary.

来源：https://stackoverflow.com/questions/7257476/how-do-i-send-or-save-a-function-and-recv-or-restore-a-function-and-execute-it-i

标签

c++

function

serialization