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#ifndef _SMALL_VECTOR_H_
#include <streambuf> // std::max - where to get this?
#include <cstring>
#include <cassert>
#define __SV_MAX_STATIC 2
class SmallVector {
public:
SmallVector() : size_(0) {}
explicit SmallVector(size_t s, int v = 0) : size_(s) {
assert(s < 0x80);
if (s <= __SV_MAX_STATIC) {
for (int i = 0; i < s; ++i) data_.vals[i] = v;
} else {
capacity_ = s;
size_ = s;
data_.ptr = new int[s];
for (int i = 0; i < size_; ++i) data_.ptr[i] = v;
}
}
SmallVector(const SmallVector& o) : size_(o.size_) {
if (size_ <= __SV_MAX_STATIC) {
for (int i = 0; i < __SV_MAX_STATIC; ++i) data_.vals[i] = o.data_.vals[i];
} else {
capacity_ = size_ = o.size_;
data_.ptr = new int[capacity_];
std::memcpy(data_.ptr, o.data_.ptr, size_ * sizeof(int));
}
}
const SmallVector& operator=(const SmallVector& o) {
if (size_ <= __SV_MAX_STATIC) {
if (o.size_ <= __SV_MAX_STATIC) {
size_ = o.size_;
for (int i = 0; i < __SV_MAX_STATIC; ++i) data_.vals[i] = o.data_.vals[i];
} else {
capacity_ = size_ = o.size_;
data_.ptr = new int[capacity_];
std::memcpy(data_.ptr, o.data_.ptr, size_ * sizeof(int));
}
} else {
if (o.size_ <= __SV_MAX_STATIC) {
delete[] data_.ptr;
size_ = o.size_;
for (int i = 0; i < size_; ++i) data_.vals[i] = o.data_.vals[i];
} else {
if (capacity_ < o.size_) {
delete[] data_.ptr;
capacity_ = o.size_;
data_.ptr = new int[capacity_];
}
size_ = o.size_;
for (int i = 0; i < size_; ++i)
data_.ptr[i] = o.data_.ptr[i];
}
}
return *this;
}
~SmallVector() {
if (size_ <= __SV_MAX_STATIC) return;
delete[] data_.ptr;
}
void clear() {
if (size_ > __SV_MAX_STATIC) {
delete[] data_.ptr;
}
size_ = 0;
}
bool empty() const { return size_ == 0; }
size_t size() const { return size_; }
inline void ensure_capacity(unsigned char min_size) {
assert(min_size > __SV_MAX_STATIC);
if (min_size < capacity_) return;
unsigned char new_cap = std::max(static_cast<unsigned char>(capacity_ << 1), min_size);
int* tmp = new int[new_cap];
std::memcpy(tmp, data_.ptr, capacity_ * sizeof(int));
delete[] data_.ptr;
data_.ptr = tmp;
capacity_ = new_cap;
}
inline void copy_vals_to_ptr() {
capacity_ = __SV_MAX_STATIC * 2;
int* tmp = new int[capacity_];
for (int i = 0; i < __SV_MAX_STATIC; ++i) tmp[i] = data_.vals[i];
data_.ptr = tmp;
}
inline void push_back(int v) {
if (size_ < __SV_MAX_STATIC) {
data_.vals[size_] = v;
++size_;
return;
} else if (size_ == __SV_MAX_STATIC) {
copy_vals_to_ptr();
} else if (size_ == capacity_) {
ensure_capacity(size_ + 1);
}
data_.ptr[size_] = v;
++size_;
}
int& back() { return this->operator[](size_ - 1); }
const int& back() const { return this->operator[](size_ - 1); }
int& front() { return this->operator[](0); }
const int& front() const { return this->operator[](0); }
void resize(size_t s, int v = 0) {
if (s <= __SV_MAX_STATIC) {
if (size_ > __SV_MAX_STATIC) {
int tmp[__SV_MAX_STATIC];
for (int i = 0; i < s; ++i) tmp[i] = data_.ptr[i];
delete[] data_.ptr;
for (int i = 0; i < s; ++i) data_.vals[i] = tmp[i];
size_ = s;
return;
}
if (s <= size_) {
size_ = s;
return;
} else {
for (int i = size_; i < s; ++i)
data_.vals[i] = v;
size_ = s;
return;
}
} else {
if (size_ <= __SV_MAX_STATIC)
copy_vals_to_ptr();
if (s > capacity_)
ensure_capacity(s);
if (s > size_) {
for (int i = size_; i < s; ++i)
data_.ptr[i] = v;
}
size_ = s;
}
}
int& operator[](size_t i) {
if (size_ <= __SV_MAX_STATIC) return data_.vals[i];
return data_.ptr[i];
}
const int& operator[](size_t i) const {
if (size_ <= __SV_MAX_STATIC) return data_.vals[i];
return data_.ptr[i];
}
bool operator==(const SmallVector& o) const {
if (size_ != o.size_) return false;
if (size_ <= __SV_MAX_STATIC) {
for (size_t i = 0; i < size_; ++i)
if (data_.vals[i] != o.data_.vals[i]) return false;
return true;
} else {
for (size_t i = 0; i < size_; ++i)
if (data_.ptr[i] != o.data_.ptr[i]) return false;
return true;
}
}
private:
unsigned char capacity_; // only defined when size_ >= __SV_MAX_STATIC
unsigned char size_;
union StorageType {
int vals[__SV_MAX_STATIC];
int* ptr;
};
StorageType data_;
};
inline bool operator!=(const SmallVector& a, const SmallVector& b) {
return !(a==b);
}
#endif
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