C++ 17 及以上 #include <unordered_map> #include <tuple> /* * 实现std::tuple的hash函数 */ template <std::size_t Index = 0, typename... Types> size_t hashTuple(const std::tuple<Ty…
生成的类型都是对类似于元组的类型的引用。但是，std::tuple_element并不专门用于引用，这意味着编译器...
std::make_tuple是 C++ 标准库中的一个函数模板,它用于创建一个std::tuple对象。std::tuple是一个固定大小的异类值集合,可以存储不同类型的元素。std::make_tuple在编译时确定其元素的类型,并且可以接受任意数量的参数。 基础概念 std::tuple: 是一个模板类,用于存储固定数量和类型的元素。
std::tuple From cppreference.com Defined in header<tuple> template<class...Types> classtuple; (since C++11) Class templatestd::tupleis a fixed-size collection of heterogeneous values. It is a generalization ofstd::pair. Ifstd::is_trivially_destructible<Ti>::valueistruefor everyTiinTypes, ...
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hash (C++11) Relational operators (deprecated in C++20) rel_ops::operator!=rel_ops::operator> rel_ops::operator<=rel_ops::operator>= Integer comparison functions cmp_equalcmp_lesscmp_less_than (C++20)(C++20)(C++20) cmp_not_equalcmp_greatercmp_greater_than (C++20)(C++20)(C++20) in...
voidswap(tuple&other)noexcept(/* see below */); (1)(since C++11) (constexpr since C++20) constexprvoidswap(consttuple&other)noexcept(/* see below */)const; (2)(since C++23) Callsswap(which might bestd::swap, or might be found viaADL) for each element in*thisand its corresponding...
返回两个或多个相同类型的值:std::vector或std::array 返回多个不同类型的值:_牛客网_牛客在手,offer不愁
std::pair, std::tuple已经重载了bool operator==(const T&),但没有特化std::hash 所以为了能使用pair与tuple作为哈希表的键值与哈希集合的元素,需要特化std::hash函数对象(operator()返回std::size_t的哈希值),pair与tuple包含了多个元素,参与到哈希值计算中的元素都相同时,哈希值相同,所以每个元素都应该参与...
std::tuple</* CTypes */...>tuple_cat(Tuples&&...args); (since C++11) (until C++14) template<class...Tuples> constexprstd::tuple</* CTypes */...>tuple_cat(Tuples&&...args); (since C++14) (until C++23) template<tuple-like...Tuples> ...