member function with named arguments, using boost parameters library

gistfile1.cpp

/*
 * member function with named arguments, using boost parameters library
 */
#include <memory>
#include <boost/parameter/name.hpp>
#include <boost/parameter/preprocessor.hpp>

// just make it look prettier
#define __Param(x) BOOST_PARAMETER_NAME(x)
#define NamedParamMethod BOOST_PARAMETER_MEMBER_FUNCTION

class Worker : public QObject {
    Q_OBJECT

    public:
        Worker(QObject *parent = 0) : QObject(parent) {}
    public slots:
        void run();
    signals:
        void finished();
};

// use these names for named arguments
__Param(arg1)
__Param(arg2)
__Param(flag)

class MyClass {
public:
	MyClass(const QString& name) {}
	~MyClass() {}

       	NamedParamMethod(
            // return type, function name, tag (tag is doing most of the black voodoo magic behind all this)
            (int), foo, tag,
                // arg list
                (required
                    (arg1, (int))
                )
                (optional
                    (arg2, (int), 10)
                    (flag, (bool), false)
                )
        )
        {
            return(foo_impl(arg1, arg2, flag));
        }
private:
        int foo_impl(int arg1, int arg2, bool flag);
};