tuple Class
Wraps a fixed-length sequence of elements.
template<class T1, class T2, ..., class TN>
class tuple {
public:
tuple();
explicit tuple(P1, P2, ..., PN); // 0 < N
tuple(const tuple&);
template <class U1, class U2, ..., class UN>
tuple(const tuple<U1, U2, ..., UN>&);
template <class U1, class U2>
tuple(const pair<U1, U2>&); // N == 2
void swap(tuple& right);
tuple& operator=(const tuple&);
template <class U1, class U2, ..., class UN>
tuple& operator=(const tuple<U1, U2, ..., UN>&);
template <class U1, class U2>
tuple& operator=(const pair<U1, U2>&); // N == 2
};
Parameters
- TN
The type of the Nth tuple element.
Remarks
The template class describes an object that stores N objects of types T1, T2, ..., TN, respectively, where where 0 <= N <= Nmax. The extent of a tuple instance tuple<T1, T2, ..., TN> is the number N of its template arguments. The index of the template argument Ti and of the corresponding stored value of that type is i - 1. Thus, while we number the types from 1 to N in this documentation, the corresponding index values range from 0 to N - 1.
Example
// tuple.cpp
// compile with: /EHsc
#include <vector>
#include <iomanip>
#include <iostream>
#include <tuple>
#include <string>
using namespace std;
typedef tuple <int, double, string> ids;
void print_ids(const ids& i)
{
cout << "( "
<< get<0>(i) << ", "
<< get<1>(i) << ", "
<< get<2>(i) << " )." << endl;
}
int main( )
{
// Using the constructor to declare and initialize a tuple
ids p1(10, 1.1e-2, "one");
// Compare using the helper function to declare and initialize a tuple
ids p2;
p2 = make_tuple(10, 2.22e-1, "two");
// Making a copy of a tuple
ids p3(p1);
cout.precision(3);
cout << "The tuple p1 is: ( ";
print_ids(p1);
cout << "The tuple p2 is: ( ";
print_ids(p2);
cout << "The tuple p3 is: ( ";
print_ids(p3);
vector<ids> v;
v.push_back(p1);
v.push_back(p2);
v.push_back(make_tuple(3, 3.3e-2, "three"));
cout << "The tuples in the vector are" << endl;
for(vector<ids>::const_iterator i = v.begin(); i != v.end(); ++i)
{
print_ids(*i);
}
}
The tuple p1 is: ( 10, 0.011, one ). The tuple p2 is: ( 10, 0.222, two ). The tuple p3 is: ( 10, 0.011, one ). The tuples in the vector are ( 10, 0.011, one ). ( 10, 0.222, two ). ( 3, 0.033, three ).
Requirements
Header: <tuple>
Namespace: std