Write a std::u16string to file?

Question

I am trying to write a std::u16string to file
It can easily be done with std::string

// ... pseudocode
std::wofstream outfile;
outfile.open("words.txt", std::ios_base::app);
outfile << "something"; 
outfile.close();
// ...

But how can I write a std::u16string to file?

Thanks

What do you have try? Have you see this http://stackoverflow.com/questions/24952008 ? Full source code with errors? — oklas, Feb 10 '16 at 20:03
Sorry, I don't see how the question you linked is related to my question. — Simon Goodman, Feb 11 '16 at 04:29

score 2 · Accepted Answer · answered Feb 10 '16 at 20:11

2

You need to create a basic_ofstream whose char type is equivalent to the u16string value type, which should be char16_t:

typedef std::basic_ofstream<char16_t> u16ofstream;

u16ofstream outfile("words.txt", std::ios_base::app);
outfile << someu16string; 
outfile.close();

Alternatively, you can convert the u16string to a regular string and just write it to a plain ofstream, but you'll have to handle the conversion and deal with the string's encoding on your own.

wofstream may also be compatible with u16string on some platforms (specifically Windows), but it's not portable.

answered Feb 10 '16 at 20:11

Collin Dauphinee

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more universal and accuracy method is use std::u16string::value_type instead of char16_t, and analogue for anothe types – oklas Feb 10 '16 at 20:31
There is a bug with windows, you have to use `typedef std::basic_ofstream u16ofstream;` but it works fine. Thanks – Simon Goodman Feb 11 '16 at 04:26
1

so use typedef std::basic_ofstream u16ofstream; – oklas Feb 11 '16 at 06:57

Write a std::u16string to file?

1 Answers1