30 lines
810 B
C++
Executable file
30 lines
810 B
C++
Executable file
#include <fc/shared_ptr.hpp>
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#include <boost/atomic.hpp>
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#include <boost/memory_order.hpp>
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#include <assert.h>
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namespace fc {
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retainable::retainable()
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:_ref_count(1) {
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static_assert( sizeof(_ref_count) == sizeof(boost::atomic<int32_t>), "failed to reserve enough space" );
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}
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retainable::~retainable() {
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assert( _ref_count <= 0 );
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assert( _ref_count == 0 );
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}
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void retainable::retain() {
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((boost::atomic<int32_t>*)&_ref_count)->fetch_add(1, boost::memory_order_relaxed );
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}
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void retainable::release() {
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boost::atomic_thread_fence(boost::memory_order_acquire);
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if( 1 == ((boost::atomic<int32_t>*)&_ref_count)->fetch_sub(1, boost::memory_order_release ) ) {
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delete this;
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}
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}
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int32_t retainable::retain_count()const {
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return _ref_count;
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}
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}
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