std::string_view swap() method

since C++17

// Non const version only
constexpr void swap( basic_string_view& v ) noexcept;

Exchanges the view with that of v.

Parameters

• v - the view to exchange the contents with

Return value

(none)

Complexity

Constant - O(1).

Exceptions

(none)

Example

Main.cpp

#include <string_view>
#include <iostream>
 
int main() {
    auto s1{ std::string_view{"⏺⏺⏺⏺⏺"} };
    auto s2{ std::string_view{"⏹⏹⏹⏹⏹"} };
 
    std::cout << "Before : " << s1 << ' ' << s2 << "\n";
    s1.swap(s2);
    std::cout << "After  : " << s1 << ' ' << s2 << "\n";
}

Output

Before : ⏺⏺⏺⏺⏺ ⏹⏹⏹⏹⏹
After  : ⏹⏹⏹⏹⏹ ⏺⏺⏺⏺⏺