stream_tuple.h

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/*****************************************************************************
* Multiscale Universal Interface Code Coupling Library                       *
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* Copyright (C) 2019 Y. H. Tang, S. Kudo, X. Bian, Z. Li, G. E. Karniadakis  *
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#ifndef MUI_STREAM_TUPLE_H
#define MUI_STREAM_TUPLE_H
 
#include <tuple>
 
#include "stream.h"
 
namespace mui {
 
// build integer sequence 0, 1, ... in compile time
template<std::size_t... indexes>
struct index_sequence {
    typedef index_sequence<indexes...,sizeof...(indexes)> next;
};
template<std::size_t N>
struct make_index_sequence {
    typedef typename make_index_sequence<N-1>::type::next type;
};
template<>
struct make_index_sequence<0>{
    typedef index_sequence<> type;
};
 
 
namespace {
template<std::size_t N, std::size_t MAX, typename... Args>
struct input_tuple_impl_ {
    static void apply( istream& stream, std::tuple<Args...>& t){
        stream >> std::get<N>(t);
        input_tuple_impl_<N+1,MAX,Args...>::apply(stream,t);
    }
};
template<std::size_t N, typename... Args>
struct input_tuple_impl_<N,N,Args...> {
    static void apply( istream& , std::tuple<Args...>& ){}
};
}
 
template<typename... Args>
inline istream& operator>> ( istream& stream, std::tuple<Args...>& ret )
{
    std::tuple<Args...> t;
    input_tuple_impl_<0,sizeof...(Args),Args...>::apply(stream,t);
    ret.swap(t);
    return stream;
}
 
 
namespace{
template<std::size_t N, std::size_t MAX, typename... Args>
struct output_tuple_impl_ {
    static void apply( ostream& stream, const std::tuple<Args...>& t){
        stream << std::get<N>(t);
        output_tuple_impl_<N+1,MAX,Args...>::apply(stream,t);
    }
};
template<std::size_t N, typename... Args>
struct output_tuple_impl_<N,N,Args...> {
    static void apply( ostream& , const std::tuple<Args...>& ){}
};
}
 
template<typename... Args>
inline ostream& operator<< ( ostream& stream, const std::tuple<Args...>& t )
{
    output_tuple_impl_<0,sizeof...(Args),Args...>::apply(stream,t);
    return stream;
}
 
}
 
#endif