update ceph source to reef 18.1.2

[ceph.git] / ceph / src / boost / libs / describe / example / struct_to_tuple.cpp

diff --git a/ceph/src/boost/libs/describe/example/struct_to_tuple.cpp b/ceph/src/boost/libs/describe/example/struct_to_tuple.cpp
new file mode 100644 (file)
index 0000000..a1f554c
--- /dev/null
+++ b/ceph/src/boost/libs/describe/example/struct_to_tuple.cpp
@@ -0,0 +1,57 @@
+// Copyright 2021 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/describe.hpp>
+#include <tuple>
+
+namespace desc = boost::describe;
+
+template<class T, template<class...> class L, class... D>
+auto struct_to_tuple_impl( T const& t, L<D...> )
+{
+    return std::make_tuple( t.*D::pointer... );
+}
+
+template<class T,
+    class Dm = desc::describe_members<T,
+        desc::mod_public | desc::mod_inherited>,
+    class En = std::enable_if_t<!std::is_union<T>::value> >
+auto struct_to_tuple( T const& t )
+{
+    return struct_to_tuple_impl( t, Dm() );
+}
+
+#include <boost/core/type_name.hpp>
+#include <iostream>
+
+struct X
+{
+    int a = 1;
+};
+
+BOOST_DESCRIBE_STRUCT(X, (), (a))
+
+struct Y
+{
+    float b = 3.14f;
+};
+
+BOOST_DESCRIBE_STRUCT(Y, (), (b))
+
+struct Z: X, Y
+{
+};
+
+BOOST_DESCRIBE_STRUCT(Z, (X, Y), ())
+
+int main()
+{
+    Z z;
+
+    auto tp = struct_to_tuple( z );
+
+    std::cout <<
+        boost::core::type_name<decltype(tp)>() << ": "
+        << std::get<0>(tp) << ", " << std::get<1>(tp);
+}