std::wstring_convert<Codecvt,Elem,Wide_alloc,Byte_alloc>::converted
From cppreference.com
< cpp | locale | wstring convert
| Defined in header <locale>
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| std::size_t converted() const noexcept; |
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Returns the number of source characters that were successfully processed by the most recent from_bytes() or to_bytes().
Return value
Example
Run this code
#include <codecvt> #include <iostream> #include <locale> #include <string> int main() { std::string utf8 = "z\u00df\u6c34\U0001d10b"; // or u8"zß水𝄋" // or "\x7a\xc3\x9f\xe6\xb0\xb4\xf0\x9d\x84\x8b"; std::cout << "original UTF-8 string size: " << utf8.size() << '\n'; // the UTF-8 - UTF-32 standard conversion facet std::wstring_convert<std::codecvt_utf8<char32_t>, char32_t> cvt; // UTF-8 to UTF-32 std::u32string utf32 = cvt.from_bytes(utf8); std::cout << "UTF-32 string size: " << utf32.size() << '\n'; std::cout << "converted() == " << cvt.converted() << '\n'; // UTF-32 to UTF-8 utf8 = cvt.to_bytes(utf32); std::cout << "new UTF-8 string size: " << utf8.size() << '\n'; std::cout << "converted() == " << cvt.converted() << '\n'; }
Output:
original UTF-8 string size: 10 UTF-32 string size: 4 converted() == 10 new UTF-8 string size: 10 converted() == 4
Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 2174 | C++11 | wstring_convert::converted was not required to be noexcept
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required |
See also
| converts a wide string into a byte string (public member function) | |
| converts a byte string into a wide string (public member function) |