update ceph source to reef 18.1.2

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

diff --git a/ceph/src/boost/libs/describe/example/serialization.cpp b/ceph/src/boost/libs/describe/example/serialization.cpp
new file mode 100644 (file)
index 0000000..16663df
--- /dev/null
+++ b/ceph/src/boost/libs/describe/example/serialization.cpp
@@ -0,0 +1,122 @@
+// Copyright 2020 Peter Dimov
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#define _CRT_SECURE_NO_WARNINGS
+
+#include <boost/describe.hpp>
+#include <boost/mp11.hpp>
+#include <boost/serialization/serialization.hpp>
+#include <boost/serialization/base_object.hpp>
+#include <boost/serialization/vector.hpp>
+#include <boost/core/nvp.hpp>
+#include <type_traits>
+#include <cstdio>
+#include <vector>
+
+namespace app
+{
+
+template<class Archive, class T,
+    class D1 = boost::describe::describe_bases<T, boost::describe::mod_public>,
+    class D2 = boost::describe::describe_bases<T,
+        boost::describe::mod_protected | boost::describe::mod_private>,
+    class D3 = boost::describe::describe_members<T,
+        boost::describe::mod_public | boost::describe::mod_protected>,
+    class D4 = boost::describe::describe_members<T, boost::describe::mod_private>,
+    class En = std::enable_if_t< boost::mp11::mp_empty<D2>::value &&
+        boost::mp11::mp_empty<D4>::value && !std::is_union<T>::value> >
+
+    void serialize( Archive & ar, T & t, boost::serialization::version_type )
+{
+    int k = 0;
+
+    // public bases: use base_object
+
+    boost::mp11::mp_for_each<D1>([&](auto D){
+
+        using B = typename decltype(D)::type;
+
+        char name[ 32 ];
+        std::sprintf( name, "base.%d", ++k );
+
+        ar & boost::make_nvp( name, boost::serialization::base_object<B>( t ) );
+
+    });
+
+    // public (and protected) members
+
+    boost::mp11::mp_for_each<D3>([&](auto D){
+
+        ar & boost::make_nvp( D.name, t.*D.pointer );
+
+    });
+}
+
+struct A1
+{
+    int x;
+};
+
+BOOST_DESCRIBE_STRUCT(A1, (), (x))
+
+struct A2
+{
+    int y;
+};
+
+BOOST_DESCRIBE_STRUCT(A2, (), (y))
+
+struct B: public A1, public A2
+{
+    // these constructors aren't needed in C++17
+    B(): A1(), A2() {}
+    B( int x, int y ): A1{ x }, A2{ y } {}
+};
+
+BOOST_DESCRIBE_STRUCT(B, (A1, A2), ())
+
+struct C
+{
+    std::vector<B> v;
+};
+
+BOOST_DESCRIBE_STRUCT(C, (), (v))
+
+} // namespace app
+
+#include <boost/archive/xml_oarchive.hpp>
+#include <boost/archive/xml_iarchive.hpp>
+#include <boost/archive/text_oarchive.hpp>
+#include <string>
+#include <sstream>
+#include <iostream>
+
+int main()
+{
+    app::C c1{ { { 1, 2 }, { 3, 4 }, { 5, 6 } } };
+
+    std::ostringstream os;
+
+    {
+        boost::archive::xml_oarchive ar( os );
+        ar << boost::make_nvp( "c1", c1 );
+    }
+
+    std::string s = os.str();
+
+    std::cout << s << std::endl;
+
+    app::C c2;
+
+    {
+        std::istringstream is( s );
+        boost::archive::xml_iarchive ar( is );
+        ar >> boost::make_nvp( "c2", c2 );
+    }
+
+    {
+        boost::archive::text_oarchive ar( std::cout );
+        ar << c2;
+    }
+}