Re: [boost] [parameter] BOOST_PARAMETER_CONSTRUCTOR bug

Subject: Re: [boost] [parameter] BOOST_PARAMETER_CONSTRUCTOR bug
From: James Hirschorn (james.hirschorn_at_[hidden])
Date: 2013-06-07 15:41:45

The following variation does not seem to work according to the documentation. 
Can someone explain this?

--------------------

#include <iostream>

#include <boost/parameter.hpp>

BOOST_PARAMETER_NAME(name)
BOOST_PARAMETER_NAME(index)
BOOST_PARAMETER_NAME(ratio)

struct myclass_impl
{
    template <class ArgumentPack>
    myclass_impl(ArgumentPack const& args)
    {
        std::cout << "name = " << args[_name | ""]
                  << "; index = " << args[_index | 0]
                  << "; ratio = " << args[_ratio | 1.0]
                  << std::endl;
    }
};

struct myclass : myclass_impl
{
    BOOST_PARAMETER_CONSTRUCTOR(
        myclass, (myclass_impl), tag
            ,   (optional (name, (char const*)) (index, (int))
                )
                (deduced
                    (optional (ratio, *))
                )
    )

};

int main(int argc, char * argv[])
{
    myclass C(_name="hello", _index=1);
    myclass D(4.6);
}

----------------

In the construction of D, 4.6 is not deduced as having the keyword ratio,
and the program fails to compile. The deduced clause seems to be ignored.
Is this not a bug?

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