wctype
From cppreference.com
                    
                                        
                    
                    
                                                            
                    |   Defined in header  
<wctype.h>
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|   wctype_t wctype( const char* str ); 
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Constructs a value of type wctype_t that describes a LC_CTYPE category of wide character classification. It may be one of the standard classification categories, or a locale-specific category, such as "jkanji".
[edit] Parameters
| str | - | C string holding the name of the desired category | 
The following values of str are supported in all C locales:
  value of str
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effect | 
  "alnum"
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identifies the category used by iswalnum | 
  "alpha"
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identifies the category used by iswalpha | 
  "blank"
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identifies the category used by iswblank (C99) | 
  "cntrl"
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identifies the category used by iswcntrl | 
  "digit"
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identifies the category used by iswdigit | 
  "graph"
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identifies the category used by iswgraph | 
  "lower"
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identifies the category used by iswlower | 
  "print"
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identifies the category used by iswprint | 
  "space"
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identifies the category used by iswspace | 
  "upper"
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identifies the category used by iswupper | 
  "xdigit"
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identifies the category used by iswxdigit | 
[edit] Return value
wctype_t object suitable for use with iswctype to classify wide characters according to the named category of the current C locale or zero if str does not name a category supported by the current C locale.
[edit] See also
|    classifies a wide character according to the specified LC_CTYPE category    (function)  | 
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C++ documentation for wctype
 
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