ObjectsVariant.h

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#pragma once
 
#include <alib/variant>
#include <exception/CommonException.h>
#include <core/xmlApi.hpp>
 
namespace core {
 
template < typename T >
T parseVariantHelper ( ext::deque < sax::Token >::iterator & ) {
    throw exception::CommonException ( "Can't parse variant type" );
}
 
template < typename T, typename R, typename ... Ts >
T parseVariantHelper ( ext::deque < sax::Token >::iterator & input ) {
    if ( core::xmlApi < R >::first ( input ) ) return T ( core::xmlApi < R >::parse ( input ) );
 
    return parseVariantHelper < T, Ts ... > ( input );
}
 
template < typename T, typename R, typename ... Ts >
T firstVariantHelper ( ext::deque < sax::Token >::iterator & input ) {
    if ( core::xmlApi < R >::first ( input ) ) return true;
 
    return firstVariantHelper < T, Ts ... > ( input );
}
 
template < typename T >
void composeVariantHelper ( ext::deque < sax::Token > &, const T & ) {
    throw exception::CommonException ( "Can't compose variant type" );
}
 
template < typename T, typename R, typename ... Ts >
void composeVariantHelper ( ext::deque < sax::Token > & out, const T & container ) {
    if ( container.template is < R > ( ) )
        return core::xmlApi < R >::compose ( out, container.template get < R > ( ) );
 
    composeVariantHelper < T, Ts ... > ( out, container );
}
 
template < typename ... Ts >
struct xmlApi < ext::variant < Ts ... > > {
    static ext::variant < Ts ... > parse ( ext::deque < sax::Token >::iterator & input );
    static bool first ( const ext::deque < sax::Token >::const_iterator & input );
    static std::string xmlTagName ( );
    static void compose ( ext::deque < sax::Token > & output, const ext::variant < Ts ... > & input );
};
 
template < typename ... Ts >
ext::variant < Ts ... > xmlApi < ext::variant < Ts ... > >::parse ( ext::deque < sax::Token >::iterator & input ) {
    return parseVariantHelper < ext::variant < Ts ... >, Ts ... > ( input );
}
 
template < typename ... Ts >
bool xmlApi < ext::variant < Ts ... > >::first ( const ext::deque < sax::Token >::const_iterator & ) {
    return false;
}
 
template < typename ... Ts >
std::string xmlApi < ext::variant < Ts ... > >::xmlTagName ( ) {
    throw exception::CommonException ( "Variant does not have xmlTagName." );
}
 
template < typename ... Ts >
void xmlApi < ext::variant < Ts ... > >::compose ( ext::deque < sax::Token > & output, const ext::variant < Ts ... > & input ) {
    composeVariantHelper < ext::variant < Ts ... >, Ts ... > ( output, input );
}
 
} /* namespace core */