Re: [boost] Review Request: Variadic Macro Data library

Subject: Re: [boost] Review Request: Variadic Macro Data library
From: Lorenzo Caminiti (lorcaminiti_at_[hidden])
Date: 2011-02-20 14:21:54

On Sun, Feb 20, 2011 at 1:55 PM, Edward Diener <eldiener_at_[hidden]> wrote:
> Fair enough. But I believe some other proposed Boost libraries, besides my
> own TTI library, are using variadic macro syntax in their public interface.
> Why should they not do that and take advantage of pp-lib at the same time ?

For example, Boost.Local new syntax takes advantage of variadics.

If variadics (using a couple of Edward's VMD library macros behind the scenes):

#include <boost/local/function.hpp>
#include <iostream>
#include <sstream>
#include <algorithm>
#include <vector>

int main () {
    std::ostringstream output;

    int BOOST_LOCAL_FUNCTION_PARAMS(int n, bool recursion, default false,
            bind& output) {
        int result = 0;

        if (n < 2 ) result = 1;
        else result = n * factorial(n - 1, true); // Recursive call.

        if (!recursion) output << result << " ";
        return result;
    } BOOST_LOCAL_FUNCTION_NAME(factorial)

    std::vector<int> v(3);
    v[0] = 1; v[1] = 4; v[2] = 7;
    std::for_each(v.begin(), v.end(), factorial);

    std::cout << output.str() << std::endl;
    return 0;
}

In any case (variadics or not):

#include <boost/local/function.hpp>
#include <iostream>
#include <sstream>
#include <algorithm>
#include <vector>

int main () {
    std::ostringstream output;

    int BOOST_LOCAL_FUNCTION_PARAMS( (int n) (bool recursion)(default false)
            (bind& output) ) {
        int result = 0;

        if (n < 2 ) result = 1;
        else result = n * factorial(n - 1, true); // Recursive call.

        if (!recursion) output << result << " ";
        return result;
    } BOOST_LOCAL_FUNCTION_NAME(factorial)

    std::vector<int> v(3);
    v[0] = 1; v[1] = 4; v[2] = 7;
    std::for_each(v.begin(), v.end(), factorial);

    std::cout << output.str() << std::endl;
    return 0;
}

P.S. I just go this to compile :))

-- 
Lorenzo