Class iterator

src/fl/stl/basic_string.h:63–98

    };

    class iterator {
    private:
        char* ptr;
    public:
        typedef char value_type;
        typedef char& reference;
        typedef char* pointer;
        typedef fl::ptrdiff_t difference_type;
        typedef fl::random_access_iterator_tag iterator_category;

        iterator() FL_NOEXCEPT : ptr(nullptr) {}
        explicit iterator(char* p) FL_NOEXCEPT : ptr(p) {}

        reference operator*() const FL_NOEXCEPT { return *ptr; }
        pointer operator->() const FL_NOEXCEPT { return ptr; }
        iterator& operator++() FL_NOEXCEPT { ++ptr; return *this; }
        iterator operator++(int) FL_NOEXCEPT { iterator tmp = *this; ++ptr; return tmp; }
        iterator& operator--() FL_NOEXCEPT { --ptr; return *this; }
        iterator operator--(int) FL_NOEXCEPT { iterator tmp = *this; --ptr; return tmp; }

        iterator operator+(difference_type n) const FL_NOEXCEPT { return iterator(ptr + n); }
        iterator operator-(difference_type n) const FL_NOEXCEPT { return iterator(ptr - n); }
        iterator& operator+=(difference_type n) FL_NOEXCEPT { ptr += n; return *this; }
        iterator& operator-=(difference_type n) FL_NOEXCEPT { ptr -= n; return *this; }
        difference_type operator-(const iterator& other) const FL_NOEXCEPT { return ptr - other.ptr; }
        reference operator[](difference_type n) const FL_NOEXCEPT { return ptr[n]; }

        bool operator==(const iterator& other) const FL_NOEXCEPT { return ptr == other.ptr; }
        bool operator!=(const iterator& other) const FL_NOEXCEPT { return ptr != other.ptr; }
        bool operator<(const iterator& other) const FL_NOEXCEPT { return ptr < other.ptr; }
        bool operator>(const iterator& other) const FL_NOEXCEPT { return ptr > other.ptr; }
        bool operator<=(const iterator& other) const FL_NOEXCEPT { return ptr <= other.ptr; }
        bool operator>=(const iterator& other) const FL_NOEXCEPT { return ptr >= other.ptr; }

        operator char*() const FL_NOEXCEPT { return ptr; }
    };

    class const_iterator {
    private: