Convert WTF::String to String and back to WTF::String?

[Ivan Hutomo]

Hi everyone, I would to do operation in WTF::String like .substr and .find, is it possible to convert from WTF::String to String first then convert it back to WTF::String? Thank you

I am doing something like this for convert from WTF::String to String, but not sure it could work properly:

std::string url_string =  wtf_string.Utf8().data()

and from string to wtf string like below:

wtf_string = url_string.c_str()

Thank you for help.

[Ian Clelland]

You can do that, and it will work to convert between types, but you're probably doing too much work. WTF::String::Utf8() already returns a std::string, so there's no need to call data() on that and then convert it back to std::string. Similarly, WTF::String has a constructor that takes a std::string, so you don't need to extract the c_str() in order to convert back.

Even less work, though, would be to just call the Substring and find/Find methods directly on WTF::String; you may not have a need to convert to std::string in the first place.

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[Jeremy Roman]

On Sat, Nov 19, 2022 at 11:59 AM Ian Clelland <icle...@chromium.org> wrote:

You can do that, and it will work to convert between types, but you're probably doing too much work. WTF::String::Utf8() already returns a std::string, so there's no need to call data() on that and then convert it back to std::string. Similarly, WTF::String has a constructor that takes a std::string, so you don't need to extract the c_str() in order to convert back.

This constructor is unlikely to be what you want, though, since it assumes the input is ASCII or Latin-1, not UTF-8. String::FromUTF8(base::StringPiece) is the appropriate way to convert a UTF-8 string.

Note that conversion to and from UTF-8 is not a lossless operation.

 

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