求助icu库的UnicodeString

spirit_12

1. #include <iostream>
   
2. #include <locale>
   
3. 
   
4. #include <unicode/regex.h>
   
5. using namespace std;
   
6. using namespace icu;
   
7. int main() {
   
8. 
   
9.         const int MAX_SIZE = 255;
   
10. 
    
11.         locale loc("");
    
12.         wcout.imbue(loc);
    
13.        
    
14.         puts("输入文字");
    
15.         fgets(str, MAX_SIZE, stdin);
    
16.         str[strlen(str) - 1] = '\0';
    
17.         UnicodeString input(str, "gb2312");
    
18. 
    
19.         wcout<<"input:"<<input.getTerminatedBuffer()<<'\n';
    
20.         return 0;
    
21. }

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请问
使用icu库。构筑的UnicodeString构造，里面存的输入的文字，是gb2312编码？还是unicode编码？
下面是相关文档的。
我对UnicodeString不理解，他和char[],w_char[],UChar []，string都什么关系？请指点，谢谢！

###########################################
UnicodeString::UnicodeString  ( const char *  codepageData,  
  const char *  codepage = 0   
)   

char* constructor.


Parameters:
codepageData  an array of bytes, null-terminated  
codepage  the encoding of codepageData. The special value 0 for codepage indicates that the text is in the platform's default codepage.

If codepage is an empty string (""), then a simple conversion is performed on the codepage-invariant subset ("invariant characters") of the platform encoding. See utypes.h. Recommendation: For invariant-character strings use the constructor UnicodeString(const char *src, int32_t length, enum EInvariant inv) because it avoids object code dependencies of UnicodeString on the conversion code.

Stable:
ICU 2.0