NAME¶

std::swap(std::valarray) - std::swap(std::valarray)

Synopsis¶

Defined in header <valarray>
template< class T > (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).

Parameters¶

lhs, rhs - valarrays whose contents to swap

Return value¶

(none)

Complexity¶

Constant.

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}

See also¶

swap swaps with another valarray
(public member function)