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Find the last occurrence of a string within the string.
template< [role red error.param neither has a declname nor a 'class ' prefix in the type][role red error.param neither has a declname nor a 'class ' prefix in the type][role red error.param neither has a declname nor a 'class ' prefix in the type][role red error.param neither has a declname nor a 'class ' prefix in the type]> constexpr size_type rfind( const T& t, size_type pos = npos) const;
            Constructs a temporary string_view_type
            object sv from t, and finds the last occurrence of
            sv within the string
            starting before or at the index pos.
          
Linear.
| Type | Description | 
|---|---|
| 
                       | The type of the object to convert. | 
            std::is_convertible<const T&, string_view>::value
            && !std::is_convertible<const T&, const
            CharT*>::value.
          
            The highest index idx
            less than or equal to pos
            where each element of {sv.begin(),
            sv.end())
            is equal to that of {begin()
            + idx, begin()
            + idx + count) if one exists, and npos otherwise.
          
| Name | Description | 
|---|---|
| 
                       | The string to search for. | 
| 
                       | 
                      The index to start searching at. The default argument for this
                      parameter is  |