std::wstring_convert::converted
STD：：wstring[医]皈依：：
| Defined in header | | |
|---|---|---|
| std::size_t converted() const; | | |
返回最近处理的源字符数。from_bytes()或to_bytes()...
返回值
最近一次转换操作所消耗的字符数。
例外
| (none) | (until C++14) |
|---|---|
| noexcept specification: noexcept | (since C++14) |
例
二次
#include <iostream>
#include <string>
#include <locale>
#include <codecvt>
int main()
{
std::string utf8 = u8"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';
}
二次
产出：
二次
original UTF-8 string size: 10
UTF-32 string size: 4
converted() == 10
new UTF-8 string size: 10
converted() == 4
二次
另见
| to_bytes | converts a wide string into a byte string (public member function) |
|---|---|
| from_bytes | converts a byte string into a wide string (public member function) |
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