P0876R7

example/unwind_main.cpp

@@ -0,0 +1,58 @@
+
+//          Copyright Oliver Kowalke 2019.
+// Distributed under the Boost Software License, Version 1.0.
+//    (See accompanying file LICENSE_1_0.txt or copy at
+//          http://www.boost.org/LICENSE_1_0.txt)
+
+#include <cstdio>
+#include <cstdlib>
+#include <cstring>
+
+#include <unwind.h>
+
+#include <boost/context/fiber_context.hpp>
+
+namespace ctx = boost::context;
+
+struct X {
+    int i;
+    X( int i_) : i{ i_ } { std::printf("X(%d)\n", i); }
+    ~X() { std::printf("~X(%d)\n", i); }
+
+    X( X const&) = delete;
+    X& operator=( X const&) = delete;
+
+    X( X &&) = delete;
+    X& operator=( X &&) = delete;
+};
+
+ctx::fiber_context bar( ctx::fiber_context && f_foo) {
+	std::printf("bar entered\n");
+    X x2{ 2 };
+	std::printf("bar resumes foo\n");
+    f_foo = std::move( f_foo).resume();
+	std::printf("bar returns\n");
+    return std::move( f_foo);
+}
+
+ctx::fiber_context foo( ctx::fiber_context && f_main) {
+	std::printf("foo entered\n");
+    ctx::fiber_context f_bar{ bar }; 
+	std::printf("foo resumes bar\n");
+    f_bar = std::move( f_bar).resume();
+	std::printf("foo destroys main\n");
+    std::move( f_main).resume_with( ctx::unwind_fiber);
+	std::printf("foo resumes bar\n");
+    std::move( f_bar).resume();
+	std::printf("foo terminates application\n");
+    std::exit( 0);
+	return {};
+};
+
+int main( int argc, char * argv[]) {
+    X x1{ 1 };
+    ctx::fiber_context f{ foo };
+	std::printf("main resumes foo\n");
+    f = std::move( f).resume();
+    return EXIT_SUCCESS;
+}