std::tuple 在标头<tuple>定义 template<class...Types> classtuple; (C++11 起) 类模板std::tuple是固定大小的异质值的汇集。它是std::pair的泛化。 如果std::is_trivially_destructible<Ti>::value对Types中的每个Ti都是true,那么std::tuple的析构函数平凡。
__cpp_lib_tuples_by_type201304L(C++14)按类型(5-8)寻址元组 示例 运行此代码 #include <cassert>#include <iostream>#include <string>#include <tuple>intmain(){autox=std::make_tuple(1,"Foo",3.14);// 注意:std::get 会生成到 std::get<std::variant> 的错误链接usingstd::get;// 基于索引...
tuple_size (C++11) obtains the number of elements of a tuple-like type (class template) std::tuple_size<std::pair> (C++11) obtains the size of apair (class template specialization) std::tuple_size<std::array> (C++11) obtains the size of anarray ...
template<std::size_t I, class T> struct tuple_element; #ifndef __cpp_pack_indexing // recursive case template<std::size_t I, class Head, class... Tail> struct tuple_element<I, std::tuple<Head, Tail...>> : std::tuple_element<I - 1, std::tuple<Tail...>> { }; // base ...
//zh.cppreference.com/w/cpp/utility/tuplestaticstd::tuple<double,char, std::string>get_student(intid){if(id ==0)returnstd::make_tuple(3.8,'A',"Lisa Simpson");if(id ==1)returnstd::make_tuple(2.9,'C',"Milhouse Van Houten");if(id ==2)returnstd::make_tuple(1.7,'D',"Ralph ...
std::tuple是c++11提供的新模板类,在很多流行语言都有对应的实现,一般翻译为元组。使用它可以把多个不同类型的变量组合成一个对象。 简单示例 以下是std::tuple的简单示例(来源:https://en.cppreference.com/w/cpp/utility/tuple) #include<tuple>#include<iostream>#include<string>#include<stdexcept>std::tuple...
然后,std::_Tuple_impl 的每个递归层次都会继承一个基类 std::_Head_base 。这是因为 std::tuple 中每个节点都是由std::_Head_base 对象表示。比如之前的 t: 1是由 std::_Head_base<0, int> 对象表示; "Foo" 是由于 std::_Head_base<1, std::string> 对象表示; 3.14 是由 std::_Head_base<2...
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. If(std::is_trivially_destructible_v<Types>&&...)istrue, the destructor oftupleis trivial. ...
tie用于struct比较:https://zh.cppreference.com/w/cpp/utility/tuple/tie 3、Pair: 代码: // pair::pair example #include <utility> // std::pair, std::make_pair #include <string> // std::string #include <iostream> // std::cout int main () { std::pair <std::string,double> product...
std::tuple<double, char, std::string> get_student(int id){ // C++11构建tuple的写法 if (id == 0) return std::make_tuple(3.8, 'A', "Lisa Simpson"); // C++17提供了更方便的构建tuple的写法 //if (id == 0) return { 3.8, 'A', "Lisa Simpson" }; if (id == 1) return std...