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Define finally

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This commit is contained in:
Paul Licameli
2016-04-09 20:44:38 -04:00
parent 9c18d3853d
commit 7e8aad9148
1 changed files with 25 additions and 0 deletions
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src/MemoryX.h
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@@ -614,4 +614,29 @@ make_movable_with_deleter(const Deleter &d, Args&&... args)
return movable_ptr_with_deleter<T, Deleter>(safenew T(std::forward<Args>(args)...), d);
}
/*
* "finally" as in The C++ Programming Language, 4th ed., p. 358
* Useful for defining ad-hoc RAII actions.
* typical usage:
* auto cleanup = finally([&]{ ... code; ... });
*/
// Construct this from any copyable function object, such as a lambda
template <typename F>
struct Final_action {
Final_action(F f) : clean{ f } {}
~Final_action() { clean(); }
F clean;
Final_action(const Final_action&) PROHIBITED;
Final_action& operator= (const Final_action&) PROHIBITED;
};
// Function template with type deduction lets you construct Final_action
// without typing any angle brackets
template <typename F>
Final_action<F> finally (F f)
{
return Final_action<F>(f);
}
#endif // __AUDACITY_MEMORY_X_H__