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#ifndef SRC_ALIASED_STRUCT_H_
#define SRC_ALIASED_STRUCT_H_
#if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
#include "node_internals.h"
#include "v8.h"
#include <memory>
namespace node {
// AliasedStruct is a utility that allows uses a V8 Backing Store
// to be exposed to the C++/C side as a struct and to the
// JavaScript side as an ArrayBuffer to efficiently share
// data without marshalling. It is similar in nature to
// AliasedBuffer.
//
// struct Foo { int x; }
//
// AliasedStruct<Foo> foo;
// foo->x = 1;
//
// Local<ArrayBuffer> ab = foo.GetArrayBuffer();
template <typename T>
class AliasedStruct final {
public:
template <typename... Args>
explicit AliasedStruct(v8::Isolate* isolate, Args&&... args);
inline AliasedStruct(const AliasedStruct& that);
inline ~AliasedStruct();
inline AliasedStruct& operator=(AliasedStruct&& that) noexcept;
v8::Local<v8::ArrayBuffer> GetArrayBuffer() const {
return buffer_.Get(isolate_);
}
const T* Data() const { return ptr_; }
T* Data() { return ptr_; }
const T& operator*() const { return *ptr_; }
T& operator*() { return *ptr_; }
const T* operator->() const { return ptr_; }
T* operator->() { return ptr_; }
private:
v8::Isolate* isolate_;
std::shared_ptr<v8::BackingStore> store_;
T* ptr_;
v8::Global<v8::ArrayBuffer> buffer_;
};
} // namespace node
#endif // defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
#endif // SRC_ALIASED_STRUCT_H_
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