95 lines
2.2 KiB
C
95 lines
2.2 KiB
C
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#ifndef ELFSPY_THUNKHANDLE_H
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#define ELFSPY_THUNKHANDLE_H
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#include <vector>
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namespace spy
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{
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/**
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* @namespace spy
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* @class ThunkHandle
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* This holds the return from a Thunk's creation function. The Thunk itself is
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* a base class. ThunkHandle registers/deregisters the Thunk to/from the Hook
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*/
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template <typename ThunkType>
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class ThunkHandle : public ThunkType
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{
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public:
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/**
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* Register thunk member to hook and construct with optional arguments
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* @param thunks container to register/deregister Thunk from
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* @param construction arguments (if any) to pass to ThunkType constructor
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*/
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template <typename... C>
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ThunkHandle(std::vector<typename ThunkType::Base*>& thunks,
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C&&... construction);
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ThunkHandle(const ThunkHandle&) = delete;
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ThunkHandle& operator=(const ThunkHandle&) = delete;
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ThunkHandle(ThunkHandle&& move);
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ThunkHandle& operator=(ThunkHandle&& move);
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/**
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* deregister from hook
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*/
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~ThunkHandle();
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private:
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std::vector<typename ThunkType::Base*>& thunks_;
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void deregister();
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};
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template <typename ThunkType>
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template <typename... C>
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inline ThunkHandle<ThunkType>::
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ThunkHandle(std::vector<typename ThunkType::Base*>& thunks,
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C&&... construction)
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:ThunkType(std::forward<C>(construction)...)
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,thunks_(thunks)
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{
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// register the thunk
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thunks_.push_back(this);
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}
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template <typename ThunkType>
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void ThunkHandle<ThunkType>::deregister()
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{
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// find and deregister the thunk
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for (auto i = thunks_.begin(); i != thunks_.end(); ++i) {
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if (*i == this) {
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thunks_.erase(i);
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break;
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}
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}
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}
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template <typename ThunkType>
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inline ThunkHandle<ThunkType>::ThunkHandle(ThunkHandle&& move)
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:ThunkType(move)
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,thunks_(move.thunks_)
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{
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move.deregister();
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thunks_.push_back(this);
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}
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template <typename ThunkType>
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inline
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ThunkHandle<ThunkType>& ThunkHandle<ThunkType>::operator=(ThunkHandle&& move)
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{
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// thunks_ already points to the correct static member of the the ThunkType
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// as it has the function pointer in the template arguments
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move.deregister();
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thunks_.push_back(this);
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return *this;
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}
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template <typename ThunkType>
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inline ThunkHandle<ThunkType>::~ThunkHandle()
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{
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deregister();
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}
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} // namespace spy
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#endif
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