std:: swap (std::valarray)

Specializes the std::swap algorithm for std::valarray . Swaps the contents of lhs and rhs . Calls lhs. swap ( rhs ) .

Parameters

Return value

(none)

Complexity

Constant.

Example

#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);
}

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}

See also