prime/include/rstl/pointer_iterator.hpp

56 lines
2.1 KiB
C++

#ifndef _RSTL_POINTER_ITERATOR_HPP
#define _RSTL_POINTER_ITERATOR_HPP
#include "types.h"
#include "rstl/construct.hpp"
namespace rstl {
template < typename T, typename Vec, typename Alloc >
class const_pointer_iterator {
protected:
const T* current;
public:
const_pointer_iterator() : current(nullptr) {}
const_pointer_iterator(const T* begin) : current(begin) {}
void operator++() { ++current; }
void operator--() { --current; }
T* get_pointer() const { return const_cast< T* >(current); }
const T& operator*() const { return *get_pointer(); }
const T* operator->() const { return get_pointer(); }
bool CheckValid() const { return current != nullptr; }
bool operator==(const const_pointer_iterator& other) { return current == other.current; }
bool operator!=(const const_pointer_iterator& other) { return current != other.current; }
friend const_pointer_iterator operator+(const const_pointer_iterator& x, int v) { return const_pointer_iterator(x.current + v); }
friend const_pointer_iterator operator-(const const_pointer_iterator& x, int v) { return const_pointer_iterator(x.current - v); }
};
template < typename T, typename Vec, typename Alloc >
class pointer_iterator : public const_pointer_iterator< T, Vec, Alloc > {
public:
pointer_iterator() : const_pointer_iterator< T, Vec, Alloc >(nullptr) {}
pointer_iterator(T* begin) : const_pointer_iterator< T, Vec, Alloc >(begin) {}
void operator=(const T& other) {
if (this->CheckValid()) {
*get_pointer() = other;
}
}
T* get_pointer() const { return const_cast< T* >(this->current); }
// T* operator*() const { if (CheckValid()) return get_pointer(); else return
// nullptr; }
T* operator->() const { return get_pointer(); }
void destroy() const {
if (this->CheckValid()) {
rstl::destroy(get_pointer());
}
}
friend pointer_iterator operator+(const pointer_iterator& x, int v) { return pointer_iterator(x.get_pointer() + v); }
friend pointer_iterator operator-(const pointer_iterator& x, int v) { return pointer_iterator(x.get_pointer() - v); }
};
} // namespace rstl
#endif