What is the fastest way to swap two numbers?

Question

I know that it doesn't matter much at college level but in industry and the STL implementations, which algorithm of swapping is used?

Answer 1

C++ uses this.

template <typename T> void swap(T& t1, T& t2) {
T temp = std::move(t1);
t1 = std::move(t2);
t2 = std::move(temp);
}

Answer 2

▪Swap integers without a temporary variable:

a ^= b; // int temp = b
b ^= a; // b = a
a ^= b; // a = temp

Answer 3

https://code.sololearn.com/cBe8l52trUQU/?ref=app

The fastest way is to use xor bitwise operator.
-> you don't need a third variable

Answer 4

#include <algorithm>

swap (a, b);