utils: add auto_raii helper function
this helper permits to register a resource and cleanup function to keep exception safety with C like resource. For exemple, to be sure that a FILE* will be closed, you can use: auto file = auto_raii(fopen("filename"), fclose); file will auto cast to FILE* when needed, and will call fclose when going out of scope.
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src/utils.hh
29
src/utils.hh
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@ -39,6 +39,35 @@ bool operator== (const std::unique_ptr<T>& lhs, T* rhs)
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return lhs.get() == rhs;
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}
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template<typename T, typename F>
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class AutoRaii
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{
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public:
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AutoRaii(T* resource, F cleanup)
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: m_resource(resource), m_cleanup(cleanup) {}
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AutoRaii(AutoRaii&& other) : m_resource(other.m_resource),
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m_cleanup(other.m_cleanup)
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{ other.m_resource = nullptr; }
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AutoRaii(const AutoRaii&) = delete;
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AutoRaii& operator=(const AutoRaii&) = delete;
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~AutoRaii() { if (m_resource) m_cleanup(m_resource); }
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operator T*() { return m_resource; }
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private:
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T* m_resource;
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F m_cleanup;
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};
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template<typename T, typename F>
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AutoRaii<T, F> auto_raii(T* resource, F cleanup)
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{
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return AutoRaii<T, F>(resource, cleanup);
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}
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}
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#endif // utils_hh_INCLUDED
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