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#ifndef COMP6771_ASS2_FSV_H
#define COMP6771_ASS2_FSV_H
#include <algorithm>
#include <compare>
#include <cstring>
#include <functional>
#include <iterator>
#include <string>
#include <utility>
#include <vector>
namespace fsv {
using filter = std::function<bool(const char&)>;
class filtered_string_view {
private: // Private data members.
const char* string;
std::size_t length;
filter pred;
public: // Iterator definition.
class iterator {
public:
using difference_type = std::size_t;
using value_type = char;
using pointer = void;
using reference = const char&;
using iterator_category = std::bidirectional_iterator_tag;
private:
const value_type* const string = nullptr;
const std::size_t* const length = nullptr;
const filter* const predicate = nullptr;
const value_type* it = nullptr;
public:
iterator() noexcept = default;
iterator(const value_type* const& str,
const std::size_t& len,
const filter& pred,
const value_type* const& it) noexcept;
auto operator*() const noexcept -> reference;
auto operator->() const noexcept -> reference;
auto operator++() noexcept -> iterator&;
auto operator++(int) noexcept -> iterator;
auto operator--() noexcept -> iterator&;
auto operator--(int) noexcept -> iterator;
friend auto operator==(const iterator& a, const iterator& b) noexcept -> bool;
friend auto operator!=(const iterator& a, const iterator& b) noexcept -> bool;
};
using const_iterator = iterator;
using reverse_iterator = std::reverse_iterator<iterator>;
using const_reverse_iterator = reverse_iterator;
iterator begin() const noexcept;
iterator end() const noexcept;
const_iterator cbegin() const noexcept;
const_iterator cend() const noexcept;
reverse_iterator rbegin() const noexcept;
reverse_iterator rend() const noexcept;
const_reverse_iterator crbegin() const noexcept;
const_reverse_iterator crend() const noexcept;
public: // Public functions.
filtered_string_view() noexcept;
filtered_string_view(const std::string& str) noexcept;
explicit filtered_string_view(const std::string& str, filter pred) noexcept;
filtered_string_view(const char* str) noexcept;
explicit filtered_string_view(const char* str, filter pred) noexcept;
filtered_string_view(const filtered_string_view& other) noexcept;
filtered_string_view(filtered_string_view&& other) noexcept;
~filtered_string_view() noexcept = default;
auto operator=(const filtered_string_view& other) noexcept -> filtered_string_view&;
auto operator=(filtered_string_view&& other) noexcept -> filtered_string_view&;
auto operator[](const std::size_t& n) const noexcept -> const char&;
auto operator[](const int& n) const noexcept -> const char&;
auto at(const int index) const -> const char&;
auto size() const noexcept -> std::size_t;
auto empty() const noexcept -> bool;
auto data() const noexcept -> const char*;
auto predicate() const noexcept -> const filter&;
friend auto operator==(const filtered_string_view& a, const filtered_string_view& b) -> bool;
friend auto operator<=>(const filtered_string_view& a, const filtered_string_view& b) -> std::strong_ordering;
friend auto operator<<(std::ostream& os, const filtered_string_view& fsv) -> std::ostream&;
explicit operator std::string() const;
static auto default_predicate(const char&) noexcept -> bool;
};
auto compose(const filtered_string_view& fsv, const std::vector<filter>& filts) -> filtered_string_view;
auto split(const filtered_string_view& fsv, const filtered_string_view& tok) -> std::vector<filtered_string_view>;
auto substr(const filtered_string_view& fsv, const int pos = 0, const int count = 0) -> filtered_string_view;
} // namespace fsv
#endif // COMP6771_ASS2_FSV_H
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