C++ STL vector::swap() function: Here, we are going to learn about theswap() function of vector header in C++ STL with example. Submitted bySanjeev, on May 06, 2019 C++ STL vector::swap() function vector::swap() functionis used to swap/exchange the content of two vectors with the ...
function template <vector> std::swap (vector) template <class T, class Alloc> void swap (vector<T,Alloc>& x, vector<T,Alloc>& y); Exchange contents of vectors The contents of containerxare exchanged with those ofy. Both container objects must be of the same type (same template paramete...
// CPP program to illustrate// Implementation of swap() function#include<iostream>#include<vector>usingnamespacestd;intmain(){// vector container declarationvector<int> myvector1{1,2,3,4};vector<int> myvector2{3,5,7,9};// using swap() function to swap// elements of vectormyvector1.s...
// details are unimportant private: int a, b, c; // possibly lots of data — std::vector<double> v; // expensive to copy! }; class Widget { // class using the pimpl idiom public: Widget(const Widget& rhs); Widget& operator=(const Widget& rhs) { // to copy a Widget, ...
Input:myvector = 1, 2, 3 myvector.at(2);Outpu:3Input:myvector = 3, 4, 1, 7, 3 myvector.at(3);Output:7 错误和异常 如果向量中不存在该位置,则抛出out_of_range。 否则,它具有强大的无异常抛出保证。 // CPP program to illustrate// Implementation ofat() function#include<iostream>#incl...
In the below example, we see how to swap two integers usingstd::swap()function. #include <bits/stdc++.h>usingnamespacestd;intmain() {inta=10, b=20; cout<<"Before swapping:\n"; cout<<"a: "<<a<<", b: "<<b<<endl;//swap nowswap(a, b); cout<<"After swapping:\n"; cout...
vector swap 是一种操作,它用于交换两个 vector 容器的元素和容量。在 C++ 标准模板库(STL)中,swap 可以通过成员函数或全局函数实现。swap 操作会改变两个容器的内容,使得一个容器包含原本属于另一个容器的元素,同时交换它们的容量。 如何通过 swap 来“清空”一个 vector 通过使用 swap 方法,我们可以将一个 vec...
std::swap()是个很有用的函数,它可以用来交换两个变量的值,包括用户自定义的类型,只要类型支持copying操作,尤其是在STL中使用的很多,例如: int main(int argc, _TCHAR* argv[]) { ] = {,,,}; vector<); vector<, a + ); swap(vec1, vec2); ; i < vec1.size(); i++) { cout<<vec1[i...
C++ Library - <vector> C++ Library - <algorithm> C++ Library - <iterator> The C++ Advanced Library C++ Library - <any> C++ Library - <barrier> C++ Library - <bit> C++ Library - <chrono> C++ Library - <cinttypes> C++ Library - <clocale> C++ Library - <condition_variable> C++ Librar...
ps, rhs.ps); // 交换指针 swap(lhs.i, rhs.i); // 交换 int 值 swap(lhs.use, rhs.use); // 交换引用计数 std::cout << "HasPtr custom swap function called." << std::endl; } int main() { HasPtr hp1("String1"); HasPtr hp2("String2"); swap(hp1, hp2); return 0; } ...