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#ifndef PVECTOR_HPP_
#define PVECTOR_HPP_
constexpr unsigned int pvectorSizeChange = 32;
template<class T>
class pvector {
private:
T* items;
unsigned int _size;
unsigned int capacity;
public:
class iterator {
private:
T* pos;
public:
iterator(T* p)
: pos(p) {}
T operator*(void) const {
return *pos;
}
template<typename N>
iterator operator+(N inc) const {
return pos + inc;
}
iterator& operator++(void) {
++pos;
return *this;
}
template<typename N>
iterator operator-(N inc) const {
return pos - inc;
}
bool operator>(const iterator& i) const {
return pos > i.pos;
}
bool operator<(const iterator& i) const {
return pos < i.pos;
}
bool operator!=(const iterator& i) const {
return pos != i.pos;
}
};
pvector(void)
: items(new T[pvectorSizeChange]), _size(0),
capacity(pvectorSizeChange) {}
~pvector(void) {
delete items;
}
inline iterator begin(void) {
return iterator(items);
}
inline iterator end(void) {
return iterator(items + _size);
}
inline unsigned int size(void) const {
return _size;
}
T& push_back(T& t) {
if (_size >= capacity) {
auto nItems = new T[capacity + pvectorSizeChange];
for (unsigned int i = 0; i < capacity; i++)
nItems[i] = items[i];
delete items;
items = nItems;
}
auto& r = items[_size++] = t;
return r;
}
template<typename... Args>
T& emplace_back(Args... args) {
if (_size >= capacity) {
auto nItems = new T[capacity + pvectorSizeChange];
for (unsigned int i = 0; i < capacity; i++)
nItems[i] = items[i];
delete items;
items = nItems;
}
auto& r = items[_size++] = T(args...);
return r;
}
void erase(iterator it) {
for (unsigned int i = it - begin(); i < capacity; i++)
items[i] = items[i + 1];
_size--;
}
void clear(void) {
delete items;
items = new T[pvectorSizeChange];
_size = 0;
capacity = pvectorSizeChange;
}
};
#endif // PVECTOR_HPP_
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