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Showing content from https://www.tutorialspoint.com/cpp_standard_library/cpp_locale_unshift.htm below:

C++ Locale Library - unshift

C++ Locale Library - unshift Description

It is a unshift translation state and the function stops converting as soon as it fails to convert a character, or once from_end is reached and its character is successfully converted.

Declaration

Following is the declaration for std::ctype::unshift.

C++98

	
result unshift (state_type& state, 
   extern_type* to, extern_type* to_limit, extern_type*& to_next) const;

C++11

result unshift (state_type& state, 
   extern_type* to, extern_type* to_limit, extern_type*& to_next) const;

Parameters

state − It is a state object.
from, from_end − It is used to find initial and final characters of the source sequence.
from_next − It is used to find an element in the above range.
to_next − It is used to find an element in the above range.

Return Value

It returns codecvt_base::result.

Exceptions

If an exception is thrown, there are no changes in the facet object, although characters in the range may have been affected.

Data races

locale.htm

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