Showing content from https://cplusplus.com/reference/locale/collate/ below:
class template
<locale>
std::collate
template <class charT> class collate;
Facet to compare and hash strings
The collate standard facet provides functions to compare and assist in comparing strings in a locale-specific manner.
The collate class template has a protected destructor: Programs shall only construct objects of derived classes, or use those installed in locale objects (through use_facet).
All standard locale objects support at least the following facet instantiations of the collate class template as part of the collate category:
facets in locale objects description collate<char> narrow characters collate<wchar_t> wide characters
Template parameters
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charT
-
Character type.
Aliased as member char_type.
Member types member type definition description char_type The template parameter (charT) Character type string_type basic_string<charT> String type corresponding to the character type
Member constants The class contains a public static constant of type locale::id that uniquely identifies facets with collate semantics.
Public member functions
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(constructor)
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collate constructor (public member function)
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compare
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Compare character sequences (public member function)
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transform
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Transform character sequence (public member function)
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hash
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Get hash value (public member function)
Virtual protected member functions The class defines the virtual protected members which implement the behavior by default of their respective member functions:
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do_compare
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Compare character sequences [virtual] (protected virtual member function)
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do_transform
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Transform character sequence [virtual] (protected virtual member function)
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do_hash
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Get has value [virtual] (protected virtual member function)
Along with the class destructor:
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(destructor)
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collate destructor (protected member function)
Specializations At least the following specializations of this template are provided in all library implementations:
specialization collate<char> collate<wchar_t>
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