New upstream version 4.26upstream/4.26upstream

1 files changed, 35 insertions, 0 deletions

diff --git a/include/libHX/scope.hpp b/include/libHX/scope.hpp
new file mode 100644
index 0000000..0c0c70d
--- /dev/null
+++ b/include/libHX/scope.hpp
@@ -0,0 +1,35 @@
+#pragma once
+#include <exception>
+#include <utility>
+
+namespace HX {
+
+/*
+ * Modeled upon the C++ standards proposal P0052r10 / Library Fundamentals v3.
+ * Not yet present in GNU stdlibc++ or clang libc++.
+ */
+template<typename F> class scope_exit {
+	private:
+	F m_func;
+	bool m_eod = false;
+
+	public:
+	explicit scope_exit(F &&f) : m_func(std::move(f)), m_eod(true) {}
+	scope_exit(scope_exit &&o) : m_func(std::move(o.m_func)), m_eod(o.m_eod) {
+		o.m_eod = false;
+	}
+	~scope_exit() try {
+		if (m_eod)
+			m_func();
+	} catch (...) {
+	}
+	void operator=(scope_exit &&) = delete;
+	void release() noexcept { m_eod = false; }
+};
+
+template<typename F> scope_exit<F> make_scope_exit(F &&f)
+{
+	return scope_exit<F>(std::move(f));
+}
+
+} /* namespace */