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#ifndef TUPLE_H
#define TUPLE_H
#define DECLARE_INSIDE
#ifndef NO_IO
#include <iostream>
#endif
// ---------------------------------------------------------------------
// Templates for passing & returning tuples
// null type
struct null_type {};
// a const value of null_type
inline const null_type cnull() {return null_type();}
#ifndef NO_IO
std::ostream& operator<<(std::ostream& os, const null_type dummy)
{
os << "-";
return os;
}
#endif
// a global to absorb "writes" to unused tuple fields.
// would be good to get rid of this.
null_type dummy;
template
<class T0 = null_type,
class T1 = null_type,
class T2 = null_type,
class T3 = null_type>
class ltuple;
template
<class T0 = null_type,
class T1 = null_type,
class T2 = null_type,
class T3 = null_type>
class tuple
{
T0 el0;
T1 el1;
T2 el2;
T3 el3;
public:
friend tuple<T0,T1,T2,T3>
ltuple<T0,T1,T2,T3>::operator= (tuple<T0,T1,T2,T3>);
#ifndef NO_IO
std::ostream&
dump (std::ostream& os) {
os << "(" << el0 << "," << el1 << "," << el2 << "," << el3 << ")";
return os;
}
#endif
tuple() {}
tuple(T0 t0): el0(t0), el1(cnull()), el2(cnull()), el3(cnull()) {}
tuple(T0 t0, T1 t1): el0(t0), el1(t1), el2(cnull()), el3(cnull()) {}
tuple(T0 t0, T1 t1, T2 t2): el0(t0), el1(t1), el2(t2), el3(cnull()) {}
tuple(T0 t0, T1 t1, T2 t2, T3 t3): el0(t0), el1(t1), el2(t2), el3(t3) {}
};
#ifndef NO_IO
template<class T0, class T1, class T2, class T3>
std::ostream& operator<<(std::ostream& os, tuple<T0,T1,T2,T3> src)
{
return src.dump(os);
}
#endif
template
<class T0,
class T1,
class T2,
class T3>
class ltuple
{
private:
T0 &el0;
T1 &el1;
T2 &el2;
T3 &el3;
public:
#ifdef DECLARE_INSIDE
ltuple(T0 &t0, T1 &t1, T2 &t2, T3 &t3 )
: el0(t0), el1(t1), el2(t2), el3(t3)
{}
tuple<T0,T1,T2,T3>
operator= (tuple<T0,T1,T2,T3> src)
{
el0 = src.el0;
el1 = src.el1;
el2 = src.el2;
el3 = src.el3;
return src;
}
#else
ltuple(T0 &t0, T1 &t1, T2 &t2, T3 &t3 );
tuple<T0,T1,T2,T3>
operator= (tuple<T0,T1,T2,T3> src);
#endif
};
#ifndef DECLARE_INSIDE
template <class T0, class T1, class T2, class T3>
ltuple<T0,T1,T2,T3>::ltuple(T0 &t0, T1 &t1, T2 &t2, T3 &t3 )
: el0(t0), el1(t1), el2(t2), el3(t3)
{}
template <class T0, class T1, class T2, class T3>
tuple<T0,T1,T2,T3>
ltuple<T0,T1,T2,T3>::operator= (tuple<T0,T1,T2,T3> src)
{
el0 = src.el0;
el1 = src.el1;
el2 = src.el2;
el3 = src.el3;
return src;
}
#endif
template <class T0>
ltuple<T0>
tie(T0 &t0)
{
return ltuple<T0>(t0, dummy, dummy, dummy);
}
template <class T0, class T1>
ltuple<T0,T1>
tie(T0 &t0, T1 &t1)
{
return ltuple<T0,T1>(t0,t1,dummy,dummy);
}
template <class T0, class T1, class T2>
ltuple<T0,T1,T2>
tie(T0 &t0, T1 &t1, T2 &t2)
{
return ltuple<T0,T1,T2>(t0,t1,t2,dummy);
}
template <class T0, class T1, class T2, class T3>
ltuple<T0,T1,T2,T3>
tie(T0 &t0, T1 &t1, T2 &t2, T3 &t3)
{
return ltuple<T0,T1,T2>(t0,t1,t2,t3);
}
#endif
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