How to store functional objects with different signatures in a container?

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抹茶落季 2020-11-27 23:40

So imagine we had 2 functions (void : ( void ) ) and (std::string : (int, std::string)) and we could have 10 more. All (or some of them) take in di

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情话喂你 (楼主)

2020-11-28 00:28

You can use boost::any...

#include 
#include 
#include 
#include 

void voidFunc()
{
    std::cout << "void called" << std::endl;
}

void stringFunc(std::string str)
{
    std::cout << str << std::endl;
}

int main()
{
    std::map funcs;
    funcs.insert(std::pair("voidFunc", &voidFunc));
    funcs.insert(std::pair("stringFunc", &stringFunc));

    boost::any_cast(funcs["voidFunc"])();
    boost::any_cast(funcs["stringFunc"])("hello");
    return 0;
}

Note that you will get a runtime exception if you don't specify the function signature correctly in the any_cast.

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