library/cpp/digest/lower_case/lciter.h


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#pragma once 
 
#include <util/generic/typetraits.h> 
#include <util/string/ascii.h> 
 
#include <iterator>
 
template <class T> 
struct TLowerCaseIterator: public std::iterator<std::input_iterator_tag, T> {
    using TNonConst = std::remove_const_t<T>;
 
    inline TLowerCaseIterator(T* c) 
        : C(c) 
    { 
    } 
 
    inline TLowerCaseIterator& operator++() noexcept {
        ++C; 
 
        return *this; 
    } 
 
    inline TLowerCaseIterator operator++(int) noexcept {
        return C++; 
    } 
 
    inline TNonConst operator*() const noexcept {
        return AsciiToLower(*C); 
    } 
 
    T* C; 
}; 
 
template <class T> 
inline bool operator==(const TLowerCaseIterator<T>& l, const TLowerCaseIterator<T>& r) noexcept {
    return l.C == r.C; 
} 
 
template <class T> 
inline bool operator!=(const TLowerCaseIterator<T>& l, const TLowerCaseIterator<T>& r) noexcept {
    return !(l == r); 
}