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#pragma once
#include <util/generic/ptr.h>
#include <util/generic/noncopyable.h>
#include <util/generic/utility.h>
#include <util/system/sys_alloc.h>
template <typename T>
class TArrayWithSizeHolder : TNonCopyable {
typedef TArrayWithSizeHolder<T> TThis;
T* Data;
public:
TArrayWithSizeHolder()
: Data(nullptr)
{
}
~TArrayWithSizeHolder() {
if (!Data)
return;
for (size_t i = 0; i < Size(); ++i) {
try {
Data[i].~T();
} catch (...) {
}
}
y_deallocate(((size_t*)Data) - 1);
}
void Swap(TThis& copy) {
DoSwap(Data, copy.Data);
}
void Resize(size_t newSize) {
if (newSize == Size())
return;
TThis copy;
copy.Data = (T*)(((size_t*)y_allocate(sizeof(size_t) + sizeof(T) * newSize)) + 1);
// does not handle constructor exceptions properly
for (size_t i = 0; i < Min(Size(), newSize); ++i) {
new (copy.Data + i) T(Data[i]);
}
for (size_t i = Min(Size(), newSize); i < newSize; ++i) {
new (copy.Data + i) T;
}
((size_t*)copy.Data)[-1] = newSize;
Swap(copy);
}
size_t Size() const {
return Data ? ((size_t*)Data)[-1] : 0;
}
bool Empty() const {
return Size() == 0;
}
T* Get() {
return Data;
}
const T* Get() const {
return Data;
}
};
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