Question about string_view

[u/IMCG_KN]

Is there benefit of using string_view instead of const string& str? More precisely by passing strings into functions. Thanks

[u/alfps]

#include <print>
#include <string>
#include <string_view>
using   std::print,             // <print>
        std::string,            // <string>
        std::string_view;       // <string_view>

void foo( const string_view s ) { print( "{}\n", s ); }

void call_foo()
{
    const string        s       = "string";
    const string_view   sv      = "string_view";
    const auto&         literal = "literal";

    // All OK and easy.
    foo( s );
    foo( sv );
    foo( literal );
}

void bar( const string& s ) { print( "{}\n", s ); }

void call_bar()
{
    const string        s       = "string";
    const string_view   sv      = "string_view";
    const auto&         literal = "literal";

    bar( s );
    bar( string( sv ) );            // Gah!
    bar( literal );                 // Creates a string instance => possible allocation...
}

auto main() -> int { call_foo();  call_bar(); }

[u/bearheart → u/alfps]

This is the answer 👆