std::swap(std::valarray)
From cppreference.com
C++
Feature test macros (C++20)
Concepts library (C++20)
Metaprogramming library (C++11)
Ranges library (C++20)
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Numerics library
Mathematical special functions (C++17)
Mathematical constants (C++20)
Basic linear algebra algorithms (C++26)
Data-parallel types (SIMD) (C++26)
Floating-point environment (C++11)
Bit manipulation (C++20)
Saturation arithmetic (C++26)
(C++17)
(C++17)
(C++17)
(C++17)
(C++17)
(C++17)
std::valarray
Defined in header
<valarray>
template< class T >
void swap( std::valarray <T>& lhs, std::valarray <T>& rhs ) noexcept;
(since C++11)
void swap( std::valarray <T>& lhs, std::valarray <T>& rhs ) noexcept;
Specializes the std::swap algorithm for std::valarray . Swaps the contents of lhs and rhs. Calls lhs.swap(rhs).
[edit] Parameters
lhs, rhs
-
valarrays whose contents to swap
[edit] Return value
(none)
[edit] Complexity
Constant.
[edit] Example
Run this code
#include <iostream> #include <valarray> void print(auto rem, const std::valarray <int>& v) { std::cout << rem << '{'; for (char sep[]{0, ' ', 0}; auto elem : v) std::cout << sep << elem, *sep = ','; std::cout << "}\n"; } int main() { std::valarray x{3, 1, 4, 1, 5}; std::valarray y{2, 7, 1, 8}; print("Before swap:\n" "x: ", x); print("y: ", y); std::swap (x, y); print("After swap:\n" "x: ", x); print("y: ", y); }
Output:
Before swap:
x: {3, 1, 4, 1, 5}
y: {2, 7, 1, 8}
After swap:
x: {2, 7, 1, 8}
y: {3, 1, 4, 1, 5}