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[ref_counter] Make ref_counter an abstract base class.

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Forces people to override correctly.

Also make no_op_ref_counter final.
This commit is contained in:
Joe Thornber 2020-04-08 12:22:28 +01:00
parent 501299a4ee
commit 1481ed0f8a
1 changed files with 9 additions and 4 deletions
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13
persistent-data/data-structures/ref_counter.h
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@ -30,13 +30,18 @@ namespace persistent_data {
boost::shared_ptr<ref_counter<ValueType> > ptr; boost::shared_ptr<ref_counter<ValueType> > ptr;
virtual ~ref_counter() {} virtual ~ref_counter() {}
virtual void set(ValueType const &v, uint32_t rc) {}
virtual void inc(ValueType const &v) {} virtual void set(ValueType const &v, uint32_t rc) = 0;
virtual void dec(ValueType const &v) {} virtual void inc(ValueType const &v) = 0;
virtual void dec(ValueType const &v) = 0;
}; };
template <typename ValueType> template <typename ValueType>
class no_op_ref_counter : public ref_counter<ValueType> { class no_op_ref_counter final : public ref_counter<ValueType> {
public:
virtual void set(ValueType const &v, uint32_t rc) {}
virtual void inc(ValueType const &v) {}
virtual void dec(ValueType const &v) {}
}; };
} }