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add adaptors::counting

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bolero-MURAKAMI 2012-05-22 21:16:16 +09:00
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commit ea22a6ba5c
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sprout/iterator/counting_iterator.hpp Normal file
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#ifndef SPROUT_ITERATOR_COUNTING_ITERATOR_HPP
#define SPROUT_ITERATOR_COUNTING_ITERATOR_HPP
#include <cstddef>
#include <iterator>
#include <utility>
#include <type_traits>
#include <sprout/config.hpp>
#include <sprout/iterator/next.hpp>
#include <sprout/iterator/prev.hpp>
#include <sprout/iterator/distance.hpp>
namespace sprout {
//
// counting_iterator
//
template<typename Incrementable>
class counting_iterator
: public std::iterator<
std::random_access_iterator_tag,
Incrementable,
std::ptrdiff_t,
Incrementable*,
Incrementable
>
{
public:
typedef std::random_access_iterator_tag iterator_category;
typedef Incrementable value_type;
typedef std::ptrdiff_t difference_type;
typedef value_type* pointer;
typedef value_type reference;
private:
value_type current_;
private:
public:
counting_iterator() = default;
counting_iterator(counting_iterator const&) = default;
explicit SPROUT_CONSTEXPR counting_iterator(value_type const& v)
: current_(v)
{}
template<typename U>
SPROUT_CONSTEXPR counting_iterator(counting_iterator<U> const& it)
: current_(it.current_)
{}
template<typename U>
counting_iterator& operator=(counting_iterator<U> const& it) {
counting_iterator temp(it);
temp.swap(*this);
return *this;
}
SPROUT_CONSTEXPR reference operator*() const {
return current_;
}
SPROUT_CONSTEXPR pointer operator->() const {
return &current_;
}
counting_iterator& operator++() {
++current_;
return *this;
}
counting_iterator operator++(int) {
counting_iterator result(*this);
++current_;
return result;
}
counting_iterator& operator--() {
--current_;
return *this;
}
counting_iterator operator--(int) {
counting_iterator temp(*this);
--current_;
return temp;
}
SPROUT_CONSTEXPR counting_iterator operator+(difference_type n) const {
return counting_iterator(current_ + n);
}
SPROUT_CONSTEXPR counting_iterator operator-(difference_type n) const {
return counting_iterator(current_ - n);
}
counting_iterator& operator+=(difference_type n) {
counting_iterator temp(current_ + n);
temp.swap(*this);
return *this;
}
counting_iterator& operator-=(difference_type n) {
counting_iterator temp(current_ - n);
temp.swap(*this);
return *this;
}
SPROUT_CONSTEXPR reference operator[](difference_type n) const {
return current_ + n;
}
SPROUT_CONSTEXPR counting_iterator next() const {
return counting_iterator(current_ + 1);
}
SPROUT_CONSTEXPR counting_iterator prev() const {
return counting_iterator(current_ - 1);
}
void swap(counting_iterator& other) {
using std::swap;
swap(current_, other.current_);
}
};
template<typename Incrementable1, typename Incrementable2>
SPROUT_CONSTEXPR bool operator==(
sprout::counting_iterator<Incrementable1> const& lhs,
sprout::counting_iterator<Incrementable2> const& rhs
)
{
return *lhs == *rhs;
}
template<typename Incrementable1, typename Incrementable2>
SPROUT_CONSTEXPR bool operator!=(
sprout::counting_iterator<Incrementable1> const& lhs,
sprout::counting_iterator<Incrementable2> const& rhs
)
{
return !(lhs == rhs);
}
template<typename Incrementable1, typename Incrementable2>
SPROUT_CONSTEXPR bool operator<(
sprout::counting_iterator<Incrementable1> const& lhs,
sprout::counting_iterator<Incrementable2> const& rhs
)
{
return *lhs < *rhs;
}
template<typename Incrementable1, typename Incrementable2>
SPROUT_CONSTEXPR bool operator>(
sprout::counting_iterator<Incrementable1> const& lhs,
sprout::counting_iterator<Incrementable2> const& rhs
)
{
return rhs < lhs;
}
template<typename Incrementable1, typename Incrementable2>
SPROUT_CONSTEXPR bool operator<=(
sprout::counting_iterator<Incrementable1> const& lhs,
sprout::counting_iterator<Incrementable2> const& rhs
)
{
return !(rhs < lhs);
}
template<typename Incrementable1, typename Incrementable2>
SPROUT_CONSTEXPR bool operator>=(
sprout::counting_iterator<Incrementable1> const& lhs,
sprout::counting_iterator<Incrementable2> const& rhs
)
{
return !(lhs < rhs);
}
template<typename Incrementable1, typename Incrementable2>
SPROUT_CONSTEXPR typename sprout::counting_iterator<Incrementable1>::difference_type operator-(
sprout::counting_iterator<Incrementable1> const& lhs,
sprout::counting_iterator<Incrementable2> const& rhs
)
{
return static_cast<typename sprout::counting_iterator<Incrementable1>::difference_type>(*lhs - *rhs);
}
template<typename Incrementable>
SPROUT_CONSTEXPR sprout::counting_iterator<Incrementable> operator+(
typename sprout::counting_iterator<Incrementable>::difference_type n,
sprout::counting_iterator<Incrementable> const& it
)
{
return it + n;
}
//
// make_counting_iterator
//
template<typename Incrementable>
SPROUT_CONSTEXPR sprout::counting_iterator<Incrementable>
make_counting_iterator(Incrementable const& v) {
return sprout::counting_iterator<Incrementable>(v);
}
//
// swap
//
template<typename Incrementable>
void swap(sprout::counting_iterator<Incrementable>& lhs, sprout::counting_iterator<Incrementable>& rhs)
SPROUT_NOEXCEPT_EXPR(SPROUT_NOEXCEPT_EXPR(lhs.swap(rhs)))
{
lhs.swap(rhs);
}
//
// next
//
template<typename Incrementable>
SPROUT_CONSTEXPR sprout::counting_iterator<Incrementable> next(
sprout::counting_iterator<Incrementable> const& it
)
{
return it.next();
}
template<typename Incrementable>
SPROUT_CONSTEXPR sprout::counting_iterator<Incrementable> next(
sprout::counting_iterator<Incrementable> const& it,
typename sprout::counting_iterator<Incrementable>::difference_type n
)
{
return it + n;
}
//
// prev
//
template<typename Incrementable>
SPROUT_CONSTEXPR sprout::counting_iterator<Incrementable> prev(
sprout::counting_iterator<Incrementable> const& it
)
{
return it.prev();
}
template<typename Incrementable>
SPROUT_CONSTEXPR sprout::counting_iterator<Incrementable> prev(
sprout::counting_iterator<Incrementable> const& it,
typename sprout::counting_iterator<Incrementable>::difference_type n
)
{
return it - n;
}
//
// distance
//
template<typename Incrementable>
SPROUT_CONSTEXPR typename std::iterator_traits<sprout::counting_iterator<Incrementable> >::difference_type
distance(
sprout::counting_iterator<Incrementable> first,
sprout::counting_iterator<Incrementable> last
)
{
return last - first;
}
} // namespace sprout
#endif // #ifndef SPROUT_ITERATOR_COUNTING_ITERATOR_HPP