Adding upstream version 14.2.21.upstream/14.2.21upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 47 insertions, 0 deletions

diff --git a/src/boost/libs/histogram/examples/guide_histogram_serialization.cpp b/src/boost/libs/histogram/examples/guide_histogram_serialization.cpp
new file mode 100644
index 00000000..c00ef3cd
--- /dev/null
+++ b/src/boost/libs/histogram/examples/guide_histogram_serialization.cpp
@@ -0,0 +1,47 @@
+// Copyright 2015-2018 Hans Dembinski
+//
+// 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)
+
+//[ guide_histogram_serialization
+
+#include <boost/archive/text_iarchive.hpp>
+#include <boost/archive/text_oarchive.hpp>
+#include <boost/histogram.hpp>
+#include <boost/histogram/serialization.hpp> // includes serialization code
+#include <cassert>
+#include <sstream>
+
+int main() {
+  using namespace boost::histogram;
+
+  auto a = make_histogram(axis::regular<>(3, -1.0, 1.0, "axis 0"),
+                          axis::integer<>(0, 2, "axis 1"));
+  a(0.5, 1);
+
+  std::string buf; // to hold persistent representation
+
+  // store histogram
+  {
+    std::ostringstream os;
+    boost::archive::text_oarchive oa(os);
+    oa << a;
+    buf = os.str();
+  }
+
+  auto b = decltype(a)(); // create a default-constructed second histogram
+
+  assert(b != a); // b is empty, a is not
+
+  // load histogram
+  {
+    std::istringstream is(buf);
+    boost::archive::text_iarchive ia(is);
+    ia >> b;
+  }
+
+  assert(b == a); // now b is equal to a
+}
+
+//]