std::swap(std::valarray)

Since C++11

Header: <valarray>

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

# Declarations

template< class T >
void swap( std::valarray<T>& lhs, std::valarray<T>& rhs ) noexcept;

(since C++11)

# Parameters

lhs, rhs: valarrays whose contents to swap

# Return value

(none)

# 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);
}

# See also

swap