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#pragma once
#include <util/system/defaults.h>
#include <util/generic/ptr.h>
/*
* This is really fast buffer for temporary data.
* For small sizes it works almost fast as pure alloca()
* (by using perthreaded list of free blocks),
* for big sizes it works as fast as malloc()/operator new()/...
*/
class TTempBuf {
public:
/*
* we do not want many friends for this class :)
*/
class TImpl;
TTempBuf();
TTempBuf(size_t len);
TTempBuf(const TTempBuf& b) noexcept;
TTempBuf(TTempBuf&& b) noexcept;
~TTempBuf();
TTempBuf& operator=(const TTempBuf& b) noexcept;
TTempBuf& operator=(TTempBuf&& b) noexcept;
Y_PURE_FUNCTION char* Data() noexcept;
Y_PURE_FUNCTION const char* Data() const noexcept;
Y_PURE_FUNCTION char* Current() noexcept;
Y_PURE_FUNCTION const char* Current() const noexcept;
Y_PURE_FUNCTION size_t Size() const noexcept;
Y_PURE_FUNCTION size_t Filled() const noexcept;
Y_PURE_FUNCTION size_t Left() const noexcept;
void Reset() noexcept;
void SetPos(size_t off);
char* Proceed(size_t off);
void Append(const void* data, size_t len);
Y_PURE_FUNCTION bool IsNull() const noexcept;
private:
TIntrusivePtr<TImpl> Impl_;
};
template <typename T>
class TTempArray: private TTempBuf {
private:
static T* TypedPointer(char* pointer) noexcept {
return reinterpret_cast<T*>(pointer);
}
static const T* TypedPointer(const char* pointer) noexcept {
return reinterpret_cast<const T*>(pointer);
}
static constexpr size_t RawSize(const size_t size) noexcept {
return size * sizeof(T);
}
static constexpr size_t TypedSize(const size_t size) noexcept {
return size / sizeof(T);
}
public:
TTempArray() = default;
TTempArray(size_t len)
: TTempBuf(RawSize(len))
{
}
T* Data() noexcept {
return TypedPointer(TTempBuf::Data());
}
const T* Data() const noexcept {
return TypedPointer(TTempBuf::Data());
}
T* Current() noexcept {
return TypedPointer(TTempBuf::Current());
}
const T* Current() const noexcept {
return TypedPointer(TTempBuf::Current());
}
size_t Size() const noexcept {
return TypedSize(TTempBuf::Size());
}
size_t Filled() const noexcept {
return TypedSize(TTempBuf::Filled());
}
T* Proceed(size_t off) {
return (T*)TTempBuf::Proceed(RawSize(off));
}
};
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