C++ codecvt 不是 std 标头吗?
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Is codecvt not a std header?
提问by user841550
This code compiles with Visual C++ 11 and runs as expected on Windows 7 but fails to compile using either MinGW 4.7.0 on Windows 7 or gcc 4.8.0 on Linux. Compiling with -std=c++11
flag
此代码使用 Visual C++ 11 编译并在 Windows 7 上按预期运行,但无法使用 Windows 7 上的 MinGW 4.7.0 或 Linux 上的 gcc 4.8.0 进行编译。用-std=c++11
标志编译
#include <codecvt>
#include <string>
// convert UTF-8 string to wstring
std::wstring utf8_to_wstring (const std::string& str)
{
std::wstring_convert<std::codecvt_utf8<wchar_t>> myconv;
return myconv.from_bytes(str);
}
// convert wstring to UTF-8 string
std::string wstring_to_utf8 (const std::wstring& str)
{
std::wstring_convert<std::codecvt_utf8<wchar_t>> myconv;
return myconv.to_bytes(str);
}
Error:
错误:
codecvt: No such file or directory.
codecvt:没有这样的文件或目录。
采纳答案by user841550
The reason why GCC rejects this code is simple: libstdc++ doesn't support <codecvt>
yet.
GCC 拒绝此代码的原因很简单:libstdc++ 尚不支持<codecvt>
。
The C++11 support status pageconfirms this:
在C ++ 11的支持状态页面证实了这一点:
22.5 Standard code conversion facets N
22.5 标准代码转换方面 N
回答by lderache
The question was asked almost 3 years ago and I was surprised that I am also having same issue using Ubuntu 14.04 with fresh updates.
这个问题是在大约 3 年前提出的,我很惊讶我在使用 Ubuntu 14.04 和最新更新时也遇到了同样的问题。
Second surprise, the link provided by @Fanael shows now:
第二个惊喜,@Fanael 提供的链接现在显示:
22.5 Standard code conversion facets Y
22.5 标准代码转换方面Y
So I searched which version of GCC would fully implement C++11. Turns out that full support was added in GCC 5:
所以我搜索了哪个版本的 GCC 会完全实现 C++11。事实证明,在 GCC 5 中添加了全面支持:
https://gcc.gnu.org/gcc-5/changes.html
https://gcc.gnu.org/gcc-5/changes.html
Full support for C++11, including the following new features:
...
locale facets for Unicode conversion;
...
完全支持 C++11,包括以下新特性:
...
Unicode 转换的语言环境方面;
...
I would have been happy to put a comment on the answer if I had enough reputation :)
如果我有足够的声誉,我很乐意对答案发表评论:)
回答by jotrocken
A workaround using Boost.Locale:
使用Boost.Locale的解决方法:
#include <boost/locale/encoding_utf.hpp>
#include <string>
using boost::locale::conv::utf_to_utf;
std::wstring utf8_to_wstring(const std::string& str)
{
return utf_to_utf<wchar_t>(str.c_str(), str.c_str() + str.size());
}
std::string wstring_to_utf8(const std::wstring& str)
{
return utf_to_utf<char>(str.c_str(), str.c_str() + str.size());
}
回答by Maks
It works on Ubuntu 14.04 with gcc 5.3.
它适用于带有 gcc 5.3 的 Ubuntu 14.04。