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