[Home]  [Edit this page]  [Recent Changes]  [Special Pages]  [Help] 

---

CppSwap

---

(C++) std::swap

Used for swapping two variables. Can be found in the STL header file algorithm.h.

Example:

include <cassert>


int main()
{
  int a = 10;
  int b = 20;
  swap(a,b);
  assert(a==20 && b==10);
}

Below is the code I retrieved from the header file algorithm.

template <class T>
inline void swap (T& a, T& b)
{
  T tmp = a;
  a = b;
  b = tmp;
}

XOR swap

A less common way of swapping two integer values. Note that it does not require a temporary variable; however, in practice it can be slower than simply assigning, as the compiler can use a CPU register for the temporary rather than actual memory.

void xorSwap (int &x, int &y)
{
  x ^= y;
  y ^= x;
  x ^= y;
}

'swap' links

• C

Code links

• #include
• assert
• cassert (header file)
• include
• int
• main

[Edit this page]  [Page history]  [What links here]  [Discuss this topic]  [Printer Friendly]