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51e0bed20a
This mirrors the `finally` utility in Guidelines Support Library for ensuring that a cleanup function is always called when the utility object leaves scope, even when unwinding the stack from an exception. This is to aid in transitioning malloc/free pairs in function bodies to be more exception-safe.
37 lines
713 B
C++
37 lines
713 B
C++
#ifndef __SRB2_CXXUTIL_HPP__
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#define __SRB2_CXXUTIL_HPP__
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#include <type_traits>
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#include <utility>
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namespace srb2 {
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template <class F>
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class Finally {
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public:
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explicit Finally(const F& f) noexcept : f_(f) {}
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explicit Finally(F&& f) noexcept : f_(f) {}
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Finally(Finally&& from) noexcept : f_(std::move(from.f_)), call_(std::exchange(from.call_, false)) {}
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Finally(const Finally& from) = delete;
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void operator=(const Finally& from) = delete;
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void operator=(Finally&& from) = delete;
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~Finally() noexcept {
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f_();
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}
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private:
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F f_;
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bool call_ = true;
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};
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template <class F>
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Finally<std::decay_t<F>> finally(F&& f) noexcept {
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return Finally {std::forward<F>(f)};
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}
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}
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#endif // __SRB2_CXXUTIL_HPP__
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