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Copy pathcompress.hpp
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162 lines (130 loc) · 4.75 KB
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#ifndef ITER_COMPRESS_H_
#define ITER_COMPRESS_H_
#include "internal/iterbase.hpp"
#include <utility>
#include <iterator>
#include <initializer_list>
namespace iter {
namespace impl {
template <typename Container, typename Selector>
class Compressed;
}
template <typename Container, typename Selector>
impl::Compressed<Container, Selector> compress(Container&&, Selector&&);
template <typename T, typename Selector>
impl::Compressed<std::initializer_list<T>, Selector> compress(
std::initializer_list<T>, Selector&&);
template <typename Container, typename T>
impl::Compressed<Container, std::initializer_list<T>> compress(
Container&&, std::initializer_list<T>);
template <typename T, typename U>
impl::Compressed<std::initializer_list<T>, std::initializer_list<U>> compress(
std::initializer_list<T>, std::initializer_list<U>);
}
template <typename Container, typename Selector>
class iter::impl::Compressed {
private:
Container container;
Selector selectors;
friend Compressed iter::compress<Container, Selector>(
Container&&, Selector&&);
template <typename T, typename Sel>
friend Compressed<std::initializer_list<T>, Sel> iter::compress(
std::initializer_list<T>, Sel&&);
template <typename Con, typename T>
friend Compressed<Con, std::initializer_list<T>> iter::compress(
Con&&, std::initializer_list<T>);
template <typename T, typename U>
friend Compressed<std::initializer_list<T>, std::initializer_list<U>>
iter::compress(std::initializer_list<T>, std::initializer_list<U>);
// Selector::Iterator type
using selector_iter_type = decltype(std::begin(selectors));
Compressed(Container&& in_container, Selector&& in_selectors)
: container(std::forward<Container>(in_container)),
selectors(std::forward<Selector>(in_selectors)) {}
public:
Compressed(Compressed&&) = default;
class Iterator : public std::iterator<std::input_iterator_tag,
iterator_traits_deref<Container>> {
private:
iterator_type<Container> sub_iter;
iterator_type<Container> sub_end;
selector_iter_type selector_iter;
selector_iter_type selector_end;
void increment_iterators() {
++this->sub_iter;
++this->selector_iter;
}
void skip_failures() {
while (this->sub_iter != this->sub_end
&& this->selector_iter != this->selector_end
&& !*this->selector_iter) {
this->increment_iterators();
}
}
public:
Iterator(iterator_type<Container>&& cont_iter,
iterator_type<Container>&& cont_end, selector_iter_type&& sel_iter,
selector_iter_type&& sel_end)
: sub_iter{std::move(cont_iter)},
sub_end{std::move(cont_end)},
selector_iter{std::move(sel_iter)},
selector_end{std::move(sel_end)} {
this->skip_failures();
}
iterator_deref<Container> operator*() {
return *this->sub_iter;
}
iterator_arrow<Container> operator->() {
return apply_arrow(this->sub_iter);
}
Iterator& operator++() {
this->increment_iterators();
this->skip_failures();
return *this;
}
Iterator operator++(int) {
auto ret = *this;
++*this;
return ret;
}
bool operator!=(const Iterator& other) const {
return this->sub_iter != other.sub_iter
&& this->selector_iter != other.selector_iter;
}
bool operator==(const Iterator& other) const {
return !(*this != other);
}
};
Iterator begin() {
return {std::begin(this->container), std::end(this->container),
std::begin(this->selectors), std::end(this->selectors)};
}
Iterator end() {
return {std::end(this->container), std::end(this->container),
std::end(this->selectors), std::end(this->selectors)};
}
};
template <typename Container, typename Selector>
iter::impl::Compressed<Container, Selector> iter::compress(
Container&& container, Selector&& selectors) {
return {
std::forward<Container>(container), std::forward<Selector>(selectors)};
}
template <typename T, typename Selector>
iter::impl::Compressed<std::initializer_list<T>, Selector> iter::compress(
std::initializer_list<T> data, Selector&& selectors) {
return {std::move(data), std::forward<Selector>(selectors)};
}
template <typename Container, typename T>
iter::impl::Compressed<Container, std::initializer_list<T>> iter::compress(
Container&& container, std::initializer_list<T> selectors) {
return {std::forward<Container>(container), std::move(selectors)};
}
template <typename T, typename U>
iter::impl::Compressed<std::initializer_list<T>, std::initializer_list<U>>
iter::compress(
std::initializer_list<T> data, std::initializer_list<U> selectors) {
return {std::move(data), std::move(selectors)};
}
#endif