CODEWITHSUNDEEP
c++string
mitesh
mitesh

Reputation: 347

how to print u32string and u16string to the console in c++

I recently bumped into string literals and found some new strings like u16string and u32string. I found that wstring can be printed to the console using std::wcout, but that doesn't work for u16string or u32string. How can i print these to the Console??

Upvotes: 18

Views: 10994

Answers (2)

Barney Szabolcs
Barney Szabolcs

Reputation: 12524

@Burgers' solution works in clang 12.0.0 (macOS Catalina XCode)

Note that for u32string you need to use char32_t.

#include <iostream>
#include <string>
#include <locale>
#include <codecvt>

int main() {
  using namespace std;
  u32string str = u"εΎˆζœ‰η”¨πŸ‘";  // btw. str.size() == 4
  
  wstring_convert<codecvt_utf8<char32_t>, char32_t> converter;

  cout << converter.to_bytes(str) << endl;

  return 0;
}

Upvotes: 1

Bur
Bur

Reputation: 157

I guess the below code would work, but note that <codecvt> is deprecated in c++17.

#include <iostream>
#include <string>
#include <locale>
#include <codecvt>

int main() {
  std::u16string str = u"sample";
  
  std::wstring_convert<std::codecvt_utf8<char16_t>, char16_t> converter;
  std::cout << converter.to_bytes(str) << std::endl;

  return 0;
}

Maybe something like this could work as well,

#include <string>
#include <iostream>

int main() {
  std::u16string str(u"abcdefg");
  for (const auto& c: str)
    std::cout << static_cast<char>(c);
}

Not sure how robust the latter is, and how efficient you need it to be.

Upvotes: 7

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