51 lines
1.2 KiB
C
51 lines
1.2 KiB
C
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#pragma once
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#include <type_traits>
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#include <utility>
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namespace c10 {
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/**
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* Mostly copied from https://llvm.org/doxygen/ScopeExit_8h_source.html
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*/
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template <typename Callable>
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class scope_exit {
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Callable ExitFunction;
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bool Engaged = true; // False once moved-from or release()d.
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public:
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template <typename Fp>
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// NOLINTNEXTLINE(bugprone-forwarding-reference-overload)
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explicit scope_exit(Fp&& F) : ExitFunction(std::forward<Fp>(F)) {}
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scope_exit(scope_exit&& Rhs) noexcept
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: ExitFunction(std::move(Rhs.ExitFunction)), Engaged(Rhs.Engaged) {
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Rhs.release();
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}
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scope_exit(const scope_exit&) = delete;
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scope_exit& operator=(scope_exit&&) = delete;
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scope_exit& operator=(const scope_exit&) = delete;
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void release() {
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Engaged = false;
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}
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~scope_exit() {
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if (Engaged) {
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ExitFunction();
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}
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}
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};
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// Keeps the callable object that is passed in, and execute it at the
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// destruction of the returned object (usually at the scope exit where the
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// returned object is kept).
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//
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// Interface is specified by p0052r2.
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template <typename Callable>
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scope_exit<std::decay_t<Callable>> make_scope_exit(Callable&& F) {
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return scope_exit<std::decay_t<Callable>>(std::forward<Callable>(F));
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}
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} // namespace c10
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