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/*
Copyright (c) 2008 TrueCrypt Developers Association. All rights reserved.
Governed by the TrueCrypt License 3.0 the full text of which is contained in
the file License.txt included in TrueCrypt binary and source code distribution
packages.
*/
#ifndef TC_HEADER_Platform_SharedPtr
#define TC_HEADER_Platform_SharedPtr
#include <stdexcept>
#include "SharedVal.h"
#ifdef nullptr
namespace VeraCrypt
{
template <class T>
class SharedPtr
{
public:
explicit SharedPtr ()
: Pointer (nullptr), UseCount (nullptr) { }
explicit SharedPtr (T *pointer)
: Pointer (pointer), UseCount (new SharedVal <uint64> (1)) { }
SharedPtr (const SharedPtr &source)
{
CopyFrom (source);
}
~SharedPtr ()
{
Release();
}
SharedPtr &operator= (const SharedPtr &source)
{
if (&source == this)
return *this;
Release();
CopyFrom (source);
return *this;
}
bool operator == (const SharedPtr &other)
{
return get() == other.get();
}
bool operator != (const SharedPtr &other)
{
return get() != other.get();
}
T &operator* () const
{
#ifdef DEBUG
if (Pointer == nullptr)
throw std::runtime_error (SRC_POS);
#endif
return *Pointer;
}
T *operator-> () const
{
#ifdef DEBUG
if (Pointer == nullptr)
throw std::runtime_error (SRC_POS);
#endif
return Pointer;
}
operator bool () const
{
return Pointer != nullptr;
}
T *get () const
{
return Pointer;
}
void reset ()
{
Release();
}
void reset (T *pointer)
{
*this = SharedPtr (pointer);
}
uint64 use_count () const
{
if (!UseCount)
return 0;
return *UseCount;
}
protected:
void CopyFrom (const SharedPtr &source)
{
Pointer = source.Pointer;
UseCount = source.UseCount;
if (UseCount)
UseCount->Increment();
}
void Release ()
{
if (UseCount != nullptr)
{
if (UseCount->Decrement() == 0)
{
if (Pointer != nullptr)
delete Pointer;
delete UseCount;
}
Pointer = nullptr;
UseCount = nullptr;
}
}
T *Pointer;
SharedVal <uint64> *UseCount;
};
#ifdef shared_ptr
#undef shared_ptr
#endif
#define shared_ptr VeraCrypt::SharedPtr
#ifdef make_shared
#undef make_shared
#endif
template <class T> shared_ptr <T> make_shared ()
{
return shared_ptr <T> (new T ());
}
template <class T, class A> shared_ptr <T> make_shared (const A &arg)
{
return shared_ptr <T> (new T (arg));
}
#define make_shared VeraCrypt::make_shared
}
#endif // nullptr
#define make_shared_auto(typeName,instanceName) shared_ptr <typeName> instanceName (new typeName ())
#endif // TC_HEADER_Platform_SharedPtr
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