35 lines
884 B
C++
35 lines
884 B
C++
#ifndef REF_COUNTED_H
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#define REF_COUNTED_H
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#include "mbed.h"
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/**
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* Base class for payload for ref-counted objects. Used by ManagedString and MicroBitImage.
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* There is no constructor, as this struct is typically malloc()ed.
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*/
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struct RefCounted
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{
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public:
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/**
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* The high 15 bits hold the number of outstanding references. The lowest bit is always 1
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* to make sure it doesn't look like vtable.
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* Should never be even or one (object should be deleted then).
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* When it's set to 0xffff, it means the object sits in flash and should not be counted.
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*/
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uint16_t refCount;
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/** Increment reference count. */
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void incr();
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/** Decrement reference count. */
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void decr();
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/** Initializes for one outstanding reference. */
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void init();
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/** Checks if the object sits in flash memory. */
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bool isReadOnly();
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};
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#endif
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