55 lines
1.3 KiB
C++
55 lines
1.3 KiB
C++
#pragma once
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#include <unordered_set>
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#include <memory>
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namespace effil {
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// Unique handle for all objects spawned from one object.
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using GCHandle = void*;
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// Mock handle for non gc objects
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static const GCHandle GCNull = nullptr;
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// GCObject interface represents beheiviour of object.
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// Multiple views may hold shred instance of Impl.
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class BaseGCObject {
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public:
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virtual ~BaseGCObject() = default;
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virtual GCHandle handle() const = 0;
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virtual size_t instances() const = 0;
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virtual std::unordered_set<GCHandle> refers() const = 0;
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};
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template<typename Impl>
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class GCObject : public BaseGCObject {
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public:
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GCObject() : ctx_(std::make_shared<Impl>())
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{}
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// All views are copy constructable
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GCObject(const GCObject&) = default;
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GCObject& operator=(const GCObject&) = default;
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// Unique handle for any copy of GCData in any lua state
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GCHandle handle() const final {
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return reinterpret_cast<GCHandle>(ctx_.get());
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}
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// Number of instances
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// always greater than 1
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// GC holds one copy
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size_t instances() const final {
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return ctx_.use_count();
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}
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std::unordered_set<GCHandle> refers() const {
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return ctx_->refers();
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}
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protected:
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std::shared_ptr<Impl> ctx_;
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};
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} // namespace effil
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