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; } ...
This function does not return anything.Example 1Let's look at the following example, where we are going to perform the swap between two optional objects.Open Compiler #include <iostream> #include <optional> int main() { std::optional < int > x1 = 11; std::optional < int > x2 = 22...
In the below example, we see how to swap two user-defined objects usingstd::swap()function. Here we have defined a student class as we see how swap swaps the content between them. #include <bits/stdc++.h>usingnamespacestd;classstudent{public:introll; string name;intmarks; student() {...
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Swap in C C++ C# Java 写一个函数交换两个变量的值。 C: 错误的实现: voidswap(inti,intj) {intt =i; i=j; j=t; } 因为C语言的函数参数是以值来传递的(pass by value),参数传递时被copy了,所以函数中交换的是复制后的值。 正确的实现:...
swap函数一般是一个程序员自定义函数。通常是实现两个变量数值的交换,用法比较广泛。可使用临时变量实现交换；可通过临时指针变量实现交换；可借助指针加入临时变量来实现交换。return 0;} swap1: x:4,y:3 swap2: x:4,y:3 swap3: x:3,y:4 swap4: x:4,y:3 swap5: x:3,y:4 swap6: x...
std::basic_string::swap void swap (basic_string& str); Swap string values Exchanges the content of the container by the content ofstr, which is anotherbasic_stringobject of the same type.Lengthsmay differ. After the call to this member function, the value of this object is the valuestrha...
A swapping function:To understand how explicit pass by reference of parameters works in C, consider implementing aswapfunction in C, that is, a function that passes in two variables and swaps their values. The code on the left below shows one failed attempt at an implementation. The code on...
insert(std::pair<int, string>(2, "f2")); m.insert(std::pair<int, string>(1, "f1")); m.insert(std::pair<int, string>(3, "f3")); map<int, string>::iterator iter; for (iter = m.begin(); iter != m.end(); iter++) { cout << iter->first << ' ' << iter->second...
function template <algorithm> std::swap_rangestemplate <class ForwardIterator1, class ForwardIterator2> ForwardIterator2 swap_ranges (ForwardIterator1 first1, ForwardIterator1 last1, ForwardIterator2 first2); Exchange values of two rangesExchanges the values of each of the elements in the range [...