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POWhat is the best practice for creating libraries that support both Unicode and ASCII in C++?
 

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  1. POWhat is the best practice for creating libraries that support both Unicode and ASCII in C++?
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    <p>I'm working on writing some libraries that will be used both internally and by customers and was wondering what the best method of supporting both Unicode and ASCII. It looks like Microsoft (in the MFC Libraries) writes both the Unicode and ASCII classes and does something similar to this in the header files using macros:</p> <pre><code>#ifdef _UNICODE #define CString CStringW #else #define CString CStringA #endif </code></pre> <p>While I'm not a huge fan of macros, it does the job. If I'm writing libraries using the STL, does it make sense to write headers that contain things like this:</p> <pre><code>#ifdef _UNICODE #define GetLastErrorString GetLastErrorStringW #else #define GetLastErrorString GetLastErrorStringA #endif std::string GetLastErrorStringA(); std::wstring GetLastErrorStringW(); </code></pre> <p>Or should I just release separate libraries, one for ASCII and one for Unicode? </p> <p>Just wondering what people think is the best thing to do in this situation.</p> <p>UPDATE: Addressing some comments and questions:</p> <ul> <li>These will be C++ class libraries.</li> <li>I believe I will need to use UTF-16 encoding as I would like to support Asian character sets.</li> <li>My reasons for implementing Unicode are twofold: 1) All new SDKs support Unicode and I'm not confident that future SDKs or third party libraries will be supporting separate ASCII versions in the future. 2) While we will not be completely internationalizing our application, it would be nice if we could handle user input (like names) and files loading from paths that contain Asian characters.</li> </ul>
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      1. POWhat is the best practice for creating libraries that support both Unicode and ASCII in C++?
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    1. COAre you developing a flat C-style API or a set of C++ classes?
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      1. POWhat is the best practice for creating libraries that support both Unicode and ASCII in C++?
      1. USMichael
    2. COThere is a problem with your example: you need to alias the return type of method as well if you want to have any chance that it compiles not the method itself (though you may have to use the #define in the implementation of the method).
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      1. POWhat is the best practice for creating libraries that support both Unicode and ASCII in C++?
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    3. COIn my experience you don't need to use UTF-16 for Asian (CJK) characters. My program handles them fine with multi-byte UTF-8 whitout any kind of sorcery.
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