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//===-- PriorityPointerPair.h ----------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef liblldb_PriorityPointerPair_h_
#define liblldb_PriorityPointerPair_h_
#include "lldb/lldb-public.h"
#include "lldb/Utility/SharingPtr.h"
namespace lldb_utility {
//----------------------------------------------------------------------
// A prioritized pair of SharedPtr<T>. One of the two pointers is high
// priority, the other is low priority.
// The Get() method always returns high, if *high != NULL,
// otherwise, low is returned (even if *low == NULL)
//----------------------------------------------------------------------
template<typename T>
class PriorityPointerPair
{
public:
typedef T& reference_type;
typedef T* pointer_type;
typedef typename std::shared_ptr<T> T_SP;
PriorityPointerPair() :
m_high(),
m_low()
{}
PriorityPointerPair(pointer_type high,
pointer_type low) :
m_high(high),
m_low(low)
{}
PriorityPointerPair(pointer_type low) :
m_high(),
m_low(low)
{}
PriorityPointerPair(T_SP& high,
T_SP& low) :
m_high(high),
m_low(low)
{}
PriorityPointerPair(T_SP& low) :
m_high(),
m_low(low)
{}
void
SwapLow(pointer_type l)
{
m_low.swap(l);
}
void
SwapHigh(pointer_type h)
{
m_high.swap(h);
}
void
SwapLow(T_SP l)
{
m_low.swap(l);
}
void
SwapHigh(T_SP h)
{
m_high.swap(h);
}
T_SP
GetLow()
{
return m_low;
}
T_SP
GetHigh()
{
return m_high;
}
T_SP
Get()
{
if (m_high.get())
return m_high;
return m_low;
}
void
ResetHigh()
{
m_high.reset();
}
void
ResetLow()
{
m_low.reset();
}
void
Reset()
{
ResetLow();
ResetHigh();
}
reference_type
operator*() const
{
return Get().operator*();
}
pointer_type
operator->() const
{
return Get().operator->();
}
~PriorityPointerPair();
private:
T_SP m_high;
T_SP m_low;
DISALLOW_COPY_AND_ASSIGN (PriorityPointerPair);
};
} // namespace lldb_utility
#endif // #ifndef liblldb_PriorityPointerPair_h_
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