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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/Utility/SharingPtr.h"
#include "lldb/lldb-public.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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