iterator

#pragma once
#include <string>
#include <set>
#include "utils.h"
inline bool is_vowel(const char c) noexcept{return c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u';}
class IterableString{
    const std::string _data;
    class StringIterator{
        const char* const _end;
        const char* _data;
    public:
        StringIterator(const char* begin, const char* end)noexcept: _end(end){_data = begin;}
        friend const StringIterator& operator++(StringIterator& s_it) noexcept{
            s_it._data++;
            while(s_it._data != s_it._end && !is_vowel(*s_it._data)){s_it._data++;}
            return s_it;
        }
        friend const StringIterator operator++(StringIterator& s_it, int) noexcept{
            auto res = s_it;
            s_it._data++;
            while(s_it._data != s_it._end && !is_vowel(*s_it._data)){s_it._data++;}
            return res;
        }
        inline bool operator!=(const StringIterator& s_it)const noexcept{return _data != s_it._data;}
        inline char operator*() const noexcept{return *_data;}
    };
public:
    IterableString() = default;
    explicit IterableString(std::string str): _data(move(str)){}
    [[nodiscard]] inline auto begin() const noexcept{return StringIterator(_data.data(),_data.data()+_data.size());}
    [[nodiscard]] inline auto end() const noexcept{return StringIterator(_data.data()+_data.size(),_data.data()+_data.size());}
};

static void IterableStringTest(){
    LOG("IterableStringTest")
    IterableString a("agbgbgbgbgbb gb gb gbgb gbgbegbgbgbbgb b gbgbg gbgbgbgb gbgb gb bgbgbgbi");
    std::string expected("aei");
    std::string result;
    for(char c: a){result.push_back(c);}
    ASSERT(expected == result)
}