how is it possible to return multiple values?

This is a discussion on how is it possible to return multiple values? within the C++ Programming forums, part of the General Programming Boards category; hello all, i wonder if it is possible in C++ , that a function returns 2 values (at least) together!? ...

  1. #1
    بابلی ریکا Masterx's Avatar
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    how is it possible to return multiple values?

    hello all, i wonder if it is possible in C++ , that a function returns 2 values (at least) together!? is it even possible ? if so who do we implement such a thing in a function?
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    Two ideas:

    Code:
    #include <utility>
    #include <iostream>
    
    std::pair<int, int> myfunc() {
       return std::pair<int, int>(0, 1);
    }
    
    int myfunc(int& ret) {
       ret = 1;
       return 0;
    }
    
    int main() 
    {
       std::pair<int, int> x = myfunc();
       std::cout << x.first << ',' << x.second << '\n';
       int tmp;
       int y = myfunc(tmp);
       std::cout << y << ',' << tmp << '\n';
    }
    There are a lot of other ways: Pointers, passing / returning a vector that holds the results, etc. Of course, if the returning values are of different types, then you'll most likely have to use references, or a struct similar to pair (Like C++0x's tuple)

  3. #3
    The superhaterodyne twomers's Avatar
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    Or return a structure if you want to return a number of variable types.

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    using pointers is probably your best bet.

    http://www.codersource.net/c++_pointers.html

    theres a nice quicklink to a pointer tutorial if you need it.

  5. #5
    and the hat of sweating
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    Quote Originally Posted by vampirekid.13 View Post
    using pointers is probably your best bet.

    C++ Pointers

    theres a nice quicklink to a pointer tutorial if you need it.
    Yuk! I would use a std:: pair, boost::tuple or struct, or just pass reference parameters as stated above. I don't think pointers would be good in this case since there are easier and safer methods available.
    "I am probably the laziest programmer on the planet, a fact with which anyone who has ever seen my code will agree." - esbo, 11/15/2008

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  6. #6
    بابلی ریکا Masterx's Avatar
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    thank you all guys , i appreciate that . tanx
    Highlight Your Codes
    The Boost C++ Libraries (online Reference)

    "...a computer is a stupid machine with the ability to do incredibly smart things, while computer programmers are smart people with the ability to do incredibly stupid things. They are,in short, a perfect match.."
    Bill Bryson


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