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std::wctrans(3)		      C++ Standard Libary	       std::wctrans(3)

NAME
       std::wctrans - std::wctrans

Synopsis
	  Defined in header <cwctype>
	  std::wctrans_t wctrans( const	char* str );

	  Constructs  a	value of type std::wctrans_t that describes a LC_CTYPE
       category	of wide
	  character mapping. It	may be one of the standard mappings, or	a  lo-
       cale-specific
	  mapping, such	as "tojhira" or	"tojkata".

Parameters
		C string holding the name of the desired mapping.

		The following values of	str are	supported in all C locales:
	  str -
		Value of str Effect
		"toupper"    identifies	the mapping used by towupper
		"tolower"    identifies	the mapping used by towlower

Return value
	  std::wctrans_t  object  suitable  for	use with std::towctrans	to map
       wide characters
	  according to the named mapping of the	current	C locale  or  zero  if
       str does	not name
	  a mapping supported by the current C locale.

See also
		    performs  character	 mapping  according  to	 the specified
       LC_CTYPE	mapping
	  towctrans category
		    (function)

http://cppreference.com		  2022.07.31		       std::wctrans(3)

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