通过

<tuple> 运算符

  • 项目

operator!=

比较 tuple 对象是否不相等。

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);

参数

TN
第 N 个元组元素的类型。

备注

如果 N 为 0，则函数返回 false，否则返回 get<0>(tpl1) != get<0>(tpl2) || get<1>(tpl1) != get<1>(tpl2) || ... || get<N - 1>(tpl1) == get<N - 1>(tpl2)。

示例

// 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<

比较 tuple 对象是否更小。

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);

参数

TN
第 N 个元组元素的类型。

注解

如果 N 大于 0，且 tpl1 中的第一个不同值小于 tpl2 中的相应值，则函数返回 ture，否则返回 false。

示例

// 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<=

比较 tuple 对象，条件为小于或等于。

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);

参数

TN
第 N 个元组元素的类型。

备注

该函数返回 !(tpl2 < tpl1)。

示例

// 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==

比较 tuple 对象是否相等。

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);

参数

TN
第 N 个元组元素的类型。

备注

如果 N 为 0，则函数返回 true，否则返回 get<0>(tpl1) == get<0>(tpl2) && get<1>(tpl1) == get<1>(tpl2) && ... && get<N - 1>(tpl1) == get<N - 1>(tpl2)。

示例

// 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>

比较 tuple 对象是否更大。

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);

参数

TN
第 N 个元组元素的类型。

备注

该函数返回 tpl2 < tpl1。

示例

// 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>=

比较 tuple 对象是否更大或相等。

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);

参数

TN
第 N 个元组元素的类型。

备注

该函数返回 !(tpl1 < tpl2)。

示例

// 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