records.h

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#pragma once
#include <map>
#include <functional>
 
namespace dg
{
namespace file
{
 
namespace detail
{
 
template<class Signature>
struct get_first_argument_type;
 
template<class R, class Arg1, class ...A>
struct get_first_argument_type<R(Arg1, A...)>
{
    using type = Arg1;
};
}//namespace detail
template<class Signature>
using get_first_argument_type_t = std::decay_t<typename detail::get_first_argument_type<Signature>::type>;
 
template<class Signature>
using get_result_type_t = typename std::function<Signature>::result_type;
 
struct LongNameAttribute
{
    auto begin() const {return m_atts.begin();}
    auto end() const {return m_atts.end();}
 
    LongNameAttribute( const char* long_name)
    : m_atts( {{"long_name", std::string(long_name)}})
    {
    }
    private:
    std::map<std::string, nc_att_t> m_atts;
 
};
 
template<class SignatureType, class Attributes = std::map<std::string, nc_att_t>>
struct Record
{
    using Signature = SignatureType; 
    std::string name; 
    Attributes atts; 
    std::function<Signature> function; 
};
 
} //namespace file
}//namespace dg