std::pair
Defined in header <utility> | | |
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template< class T1, class T2 > struct pair; | | |
std::pair是一个struct模板，它提供了将两个异构对象作为一个单元存储的方法。对是std::tuple有两个元素。
If std::is_trivially_destructible_v<T1> && std::is_trivially_destructible_v<T2> is true, the destructor of pair is trivial. | (since C++17) |
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模板参数
T1, T2 | - | the types of the elements that the pair stores. |
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成员类型
Member type | Definition |
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first_type | T1 |
second_type | T2 |
成员对象
Member name | Type |
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first | T1 |
second | T2 |
成员函数
(constructor) | constructs new pair (public member function) |
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operator= | assigns the contents (public member function) |
swap (C++11) | swaps the contents (public member function) |
非会员职能
make_pair | creates a pair object of type, defined by the argument types (function template) |
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operator==operator!=operator<operator<=operator>operator>= | lexicographically compares the values in the pair (function template) |
std::swap(std::pair) (C++11) | specializes the std::swap algorithm (function template) |
std::get(std::pair) (C++11) | accesses an element of a pair (function template) |
帮助者类
std::tuple_size<std::pair> (C++11) | obtains the size of a pair (class template specialization) |
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std::tuple_element<std::pair> (C++11) | obtains the type of the elements of pair (class template specialization) |
另见
tuple (C++11) | implements fixed size container, which holds elements of possibly different types (class template) |
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tie | creates a tuple of lvalue references or unpacks a tuple into individual objects (function template) |
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