https://isocpp.org/wiki/faq/big-picture -- possible typo

[Paul]

In https://isocpp.org/wiki/faq/big-picture it gives as an example code snippet:

auto p = find(begin(vs), end(vs), "Grail"s);
// vector<string> vs; p is vector<string>::iterator

Is the s at the end of "Grail" a typo? I can't understand it or get it to compile.
Without that s it makes perfect sense.

Thanks a lot,

Paul

[Öö Tiib]

On Friday, 7 February 2020 16:47:04 UTC+2, Paul wrote:
> In https://isocpp.org/wiki/faq/big-picture it gives as an example code snippet:
>
> auto p = find(begin(vs), end(vs), "Grail"s);
> // vector<string> vs; p is vector<string>::iterator
>
> Is the s at the end of "Grail" a typo?

No.
https://en.cppreference.com/w/cpp/string/basic_string/operator%22%22s

> I can't understand it or get it to compile.
> Without that s it makes perfect sense.

You need to have:

using namespace std::string_literals;


Or:

using std::string_literals::operator ""s;

Within current namespace.

[Tony Mc]

It means that "Grail"s is a std::string literal rather than a C-style
const char * literal. It comes from the std::string_literals namespace
and was introduced with C++14.

Tony