Accessing boost fusion map field name

Question

I\'ve been trying to use some of the boost fusion stuff to write a regular c struct to file. An XML file seems a good way to capture the data and make it compatible with oth

Answer 1

#include 
#include 

#include 
#include 
#include 
#include 
#include 
#include 

namespace fusion=boost::fusion;
namespace mpl=boost::mpl;

struct  myStructType
{
    double val1;
    double val2;
    char letter;
    int number;
}; 

BOOST_FUSION_ADAPT_STRUCT(
    myStructType,
    (double, val1)
    (double, val2)
    (char, letter)
    (int, number)
)   



template 
struct XmlFieldNamePrinter
{
    XmlFieldNamePrinter(const Sequence& seq):seq_(seq){}
    const Sequence& seq_;
    template 
    void operator() (Index idx) const
    {
        //use `Index::value` instead of `idx` if your compiler fails with it
        std::string field_name = fusion::extension::struct_member_name::call();

        std::cout
            << '<' << field_name << '>'
            << fusion::at(seq_)
            << "'
            ;
    }
};
template
void printXml(Sequence const& v)
{
    typedef mpl::range_c::value > Indices; 
    fusion::for_each(Indices(), XmlFieldNamePrinter(v));
}

int main()
{
    myStructType saveMe = { 3.4, 5.6, 'g', 9};
    printXml(saveMe);
}