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<tuple> operators

  • Artikkeli

operator!=

Compare tuple objects for inequality.

template <class T1, class T2, ..., class TN,
    class U1, class U2, ..., class UN>
bool operator!=(const tuple<T1, T2, ..., TN>& tpl1,
    const tuple<U1, U2, ..., UN>& tpl2);

Parameters

TN
The type of the Nth tuple element.

Remarks

The function returns false when N is 0, otherwise get<0>(tpl1) != get<0>(tpl2) || get<1>(tpl1) != get<1>(tpl2) || ... || get<N - 1>(tpl1) == get<N - 1>(tpl2).

Example

// std__tuple__operator_ne.cpp
// compile with: /EHsc
#include <tuple>
#include <iostream>

typedef std::tuple<int, double, int, double> Mytuple;
int main() {
    Mytuple c0(0, 1, 2, 3);

// display contents " 0 1 2 3"
    std::cout << " " << std::get<0>(c0);
    std::cout << " " << std::get<1>(c0);
    std::cout << " " << std::get<2>(c0);
    std::cout << " " << std::get<3>(c0);
    std::cout << std::endl;

    Mytuple c1 = std::make_tuple(4, 5, 6, 7);

// display contents " 4 5 6 7"
    std::cout << " " << std::get<0>(c0);
    std::cout << " " << std::get<1>(c0);
    std::cout << " " << std::get<2>(c0);
    std::cout << " " << std::get<3>(c0);
    std::cout << std::endl;

// display results of comparisons
    std::cout << std::boolalpha << " " << (c0 != c0);
    std::cout << std::endl;
    std::cout << std::boolalpha << " " << (c0 != c1);
    std::cout << std::endl;

    return (0);
}

0 1 2 3
0 1 2 3
false
true

operator<

Compare tuple objects for less.

template <class T1, class T2, ..., class TN,
    class U1, class U2, ..., class UN>
bool operator<(const tuple<T1, T2, ..., TN>& tpl1,
    const tuple<U1, U2, ..., UN>& tpl2);

Parameters

TN
The type of the Nth tuple element.

Remarks

The function returns true when N is greater than 0 and the first differing value in tpl1 compares less than the corresponding value in tpl2, otherwise it returns false.

Example

// std__tuple__operator_lt.cpp
// compile with: /EHsc
#include <tuple>
#include <iostream>

typedef std::tuple<int, double, int, double> Mytuple;
int main() {
    Mytuple c0(0, 1, 2, 3);

// display contents " 0 1 2 3"
    std::cout << " " << std::get<0>(c0);
    std::cout << " " << std::get<1>(c0);
    std::cout << " " << std::get<2>(c0);
    std::cout << " " << std::get<3>(c0);
    std::cout << std::endl;

    Mytuple c1 = std::make_tuple(4, 5, 6, 7);

// display contents " 4 5 6 7"
    std::cout << " " << std::get<0>(c0);
    std::cout << " " << std::get<1>(c0);
    std::cout << " " << std::get<2>(c0);
    std::cout << " " << std::get<3>(c0);
    std::cout << std::endl;

// display results of comparisons
    std::cout << std::boolalpha << " " << (c0 < c0);
    std::cout << std::endl;
    std::cout << std::boolalpha << " " << (c0 < c1);
    std::cout << std::endl;

    return (0);
}

0 1 2 3
0 1 2 3
false
true

operator<=

Compare tuple objects for less or equal.

template <class T1, class T2, ..., class TN,
    class U1, class U2, ..., class UN>
bool operator<=(const tuple<T1, T2, ..., TN>& tpl1,
    const tuple<U1, U2, ..., UN>& tpl2);

Parameters

TN
The type of the Nth tuple element.

Remarks

The function returns !(tpl2 < tpl1).

Example

// std__tuple__operator_le.cpp
// compile with: /EHsc
#include <tuple>
#include <iostream>

typedef std::tuple<int, double, int, double> Mytuple;
int main() {
    Mytuple c0(0, 1, 2, 3);

// display contents " 0 1 2 3"
    std::cout << " " << std::get<0>(c0);
    std::cout << " " << std::get<1>(c0);
    std::cout << " " << std::get<2>(c0);
    std::cout << " " << std::get<3>(c0);
    std::cout << std::endl;

    Mytuple c1 = std::make_tuple(4, 5, 6, 7);

// display contents " 4 5 6 7"
    std::cout << " " << std::get<0>(c0);
    std::cout << " " << std::get<1>(c0);
    std::cout << " " << std::get<2>(c0);
    std::cout << " " << std::get<3>(c0);
    std::cout << std::endl;

// display results of comparisons
    std::cout << std::boolalpha << " " << (c0 <= c0);
    std::cout << std::endl;
    std::cout << std::boolalpha << " " << (c1 <= c0);
    std::cout << std::endl;

    return (0);
}

0 1 2 3
0 1 2 3
true
false

operator==

Compare tuple objects for equality.

template <class T1, class T2, ..., class TN,
    class U1, class U2, ..., class UN>
bool operator==(const tuple<T1, T2, ..., TN>& tpl1,
    const tuple<U1, U2, ..., UN>& tpl2);

Parameters

TN
The type of the Nth tuple element.

Remarks

The function returns true when N is 0, otherwise get<0>(tpl1) == get<0>(tpl2) && get<1>(tpl1) == get<1>(tpl2) && ... && get<N - 1>(tpl1) == get<N - 1>(tpl2).

Example

// std__tuple__operator_eq.cpp
// compile with: /EHsc
#include <tuple>
#include <iostream>

typedef std::tuple<int, double, int, double> Mytuple;
int main() {
    Mytuple c0(0, 1, 2, 3);

// display contents " 0 1 2 3"
    std::cout << " " << std::get<0>(c0);
    std::cout << " " << std::get<1>(c0);
    std::cout << " " << std::get<2>(c0);
    std::cout << " " << std::get<3>(c0);
    std::cout << std::endl;

    Mytuple c1 = std::make_tuple(4, 5, 6, 7);

// display contents " 4 5 6 7"
    std::cout << " " << std::get<0>(c0);
    std::cout << " " << std::get<1>(c0);
    std::cout << " " << std::get<2>(c0);
    std::cout << " " << std::get<3>(c0);
    std::cout << std::endl;

// display results of comparisons
    std::cout << std::boolalpha << " " << (c0 == c0);
    std::cout << std::endl;
    std::cout << std::boolalpha << " " << (c0 == c1);
    std::cout << std::endl;

    return (0);
}

0 1 2 3
0 1 2 3
true
false

operator>

Compare tuple objects for greater.

template <class T1, class T2, ..., class TN,
    class U1, class U2, ..., class UN>
bool operator>(const tuple<T1, T2, ..., TN>& tpl1,
    const tuple<U1, U2, ..., UN>& tpl2);

Parameters

TN
The type of the Nth tuple element.

Remarks

The function returns tpl2 < tpl1.

Example

// std__tuple__operator_gt.cpp
// compile with: /EHsc
#include <tuple>
#include <iostream>

typedef std::tuple<int, double, int, double> Mytuple;
int main() {
    Mytuple c0(0, 1, 2, 3);

// display contents " 0 1 2 3"
    std::cout << " " << std::get<0>(c0);
    std::cout << " " << std::get<1>(c0);
    std::cout << " " << std::get<2>(c0);
    std::cout << " " << std::get<3>(c0);
    std::cout << std::endl;

    Mytuple c1 = std::make_tuple(4, 5, 6, 7);

// display contents " 4 5 6 7"
    std::cout << " " << std::get<0>(c0);
    std::cout << " " << std::get<1>(c0);
    std::cout << " " << std::get<2>(c0);
    std::cout << " " << std::get<3>(c0);
    std::cout << std::endl;

// display results of comparisons
    std::cout << std::boolalpha << " " << (c0 > c0);
    std::cout << std::endl;
    std::cout << std::boolalpha << " " << (c1 > c0);
    std::cout << std::endl;

    return (0);
}

0 1 2 3
0 1 2 3
false
true

operator>=

Compare tuple objects for greater or equal.

template <class T1, class T2, ..., class TN,
    class U1, class U2, ..., class UN>
bool operator>=(const tuple<T1, T2, ..., TN>& tpl1,
    const tuple<U1, U2, ..., UN>& tpl2);

Parameters

TN
The type of the Nth tuple element.

Remarks

The function returns !(tpl1 < tpl2).

Example

// std__tuple__operator_ge.cpp
// compile with: /EHsc
#include <tuple>
#include <iostream>

typedef std::tuple<int, double, int, double> Mytuple;
int main() {
    Mytuple c0(0, 1, 2, 3);

// display contents " 0 1 2 3"
    std::cout << " " << std::get<0>(c0);
    std::cout << " " << std::get<1>(c0);
    std::cout << " " << std::get<2>(c0);
    std::cout << " " << std::get<3>(c0);
    std::cout << std::endl;

    Mytuple c1 = std::make_tuple(4, 5, 6, 7);

// display contents " 4 5 6 7"
    std::cout << " " << std::get<0>(c0);
    std::cout << " " << std::get<1>(c0);
    std::cout << " " << std::get<2>(c0);
    std::cout << " " << std::get<3>(c0);
    std::cout << std::endl;

// display results of comparisons
    std::cout << std::boolalpha << " " << (c0 >= c0);
    std::cout << std::endl;
    std::cout << std::boolalpha << " " << (c0 >= c1);
    std::cout << std::endl;

    return (0);
}

0 1 2 3
0 1 2 3
true
false