make_pair() 的示例 // C++ program to illustrate// std::make_pair() function in C++#include<iostream>#include<utility>usingnamespacestd;intmain(){// Pair Declaredpair<int,string> p1;// Pair Initialized usingmake_pair()p1 =make_pair(1,"GeeksforGeeks");// using it with auto type deduc...
Note: The class/parameter names in the prototype do not match the version in the header file. Some have been modified to improve readability. Themake_pairSTL function creates a pair structure that contains two data elements of any type. Example 复制代码 // mkpair.cpp // compile with: /EHs...
In the following example, we are going to consider the basic usage of the make_pair() function.Open Compiler #include <iostream> #include <utility> int main() { auto x = std::make_pair(1, "Welcome"); std::cout << "Result : " << x.first << ", " << x.second << std::...
#include <iostream> #include <tuple> #include <functional> std::tuple<int, int> f() // this function returns multiple values { int x = 5; return std::make_tuple(x, 7); // return {x,7}; in C++17 } int main() { // heterogeneous tuple construction //std::tuple<int, int>{1...
问分析编译错误:没有匹配的函数调用'std::pair<，>::pair()‘ENpair是将2个数据组合成一组数据，当需要这样的需求时就可以使用pair，如stl中的map就是将key和value放在一起来保存。另一个应用是，当一个函数需要返回2个数据的时候，可以选择pair。 pair的实现是一个结构体，主要的两个成员变量是first second ...
// utility_pair.cpp// compile with: /EHsc#include<utility>#include#include<iomanip>#include<iostream>intmain( ){usingnamespacestd;// Using the constructor to declare and initialize a pairpair <int,double> p1 (10,1.1e-2);// Compare using the helper function to declare and initialize...
当我们需要指定一组比较器来对pair对象进行排序或查找操作时,可以使用STL提供的std::pair_compare结构体。该结构体可以被视为一个函数对象,支持status_free、function指针等过载函数,可以被传递给STL容器算法中的比较器参数。 下面是一个声明比较器的例子,针对以pair<int, string>为元素的vector进行按照第一个元素降序...
use of deleted function ‘std::unique_ptr<_Tp, _Dp>::unique_ptr(const std::unique_ptr<_Tp, _Dp>&) [with _Tp = std::basic_string<char>; _Dp = std::default_delete<std::basic_string<char> >]’ In file included from /usr/include/c++/4.9/memory:81:0, from test.cpp:5: /usr...
^ pair.cc:22:6: note: in instantiation of member function 'KV<char const[4]>::KV' requested...
Themake_pairSTL function creates a pair structure that contains two data elements of any type. Example 复制代码 // mkpair.cpp// compile with: /EHsc// Illustrates how to use the make_pair function. // // Functions: make_pair - creates an object pair containing...