update source to Ceph Pacific 16.2.2

[ceph.git] / ceph / src / boost / boost / io / ostream_joiner.hpp

diff --git a/ceph/src/boost/boost/io/ostream_joiner.hpp b/ceph/src/boost/boost/io/ostream_joiner.hpp
new file mode 100644 (file)
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--- /dev/null
+++ b/ceph/src/boost/boost/io/ostream_joiner.hpp
@@ -0,0 +1,118 @@
+/*
+Copyright 2019 Glen Joseph Fernandes
+(glenjofe@gmail.com)
+
+Distributed under the Boost Software License, Version 1.0.
+(http://www.boost.org/LICENSE_1_0.txt)
+*/
+#ifndef BOOST_IO_OSTREAM_JOINER_HPP
+#define BOOST_IO_OSTREAM_JOINER_HPP
+
+#include <boost/config.hpp>
+#include <ostream>
+#include <string>
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+#if !defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS)
+#include <type_traits>
+#endif
+#include <utility>
+#endif
+
+namespace boost {
+namespace io {
+namespace detail {
+
+#if !defined(BOOST_NO_CXX11_ADDRESSOF)
+template<class T>
+inline T*
+osj_address(T& o)
+{
+    return std::addressof(o);
+}
+#else
+template<class T>
+inline T*
+osj_address(T& obj)
+{
+    return &obj;
+}
+#endif
+
+} /* detail */
+
+template<class Delim, class Char = char,
+    class Traits = std::char_traits<Char> >
+class ostream_joiner {
+public:
+    typedef Char char_type;
+    typedef Traits traits_type;
+    typedef std::basic_ostream<Char, Traits> ostream_type;
+    typedef std::output_iterator_tag iterator_category;
+    typedef void value_type;
+    typedef void difference_type;
+    typedef void pointer;
+    typedef void reference;
+
+    ostream_joiner(ostream_type& output, const Delim& delim)
+        : output_(detail::osj_address(output))
+        , delim_(delim)
+        , first_(true) { }
+
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
+    ostream_joiner(ostream_type& output, Delim&& delim)
+        : output_(detail::osj_address(output))
+        , delim_(std::move(delim))
+        , first_(true) { }
+#endif
+
+    template<class T>
+    ostream_joiner& operator=(const T& value) {
+        if (!first_) {
+            *output_ << delim_;
+        }
+        first_ = false;
+        *output_ << value;
+        return *this;
+    }
+
+    ostream_joiner& operator*() BOOST_NOEXCEPT {
+        return *this;
+    }
+
+    ostream_joiner& operator++() BOOST_NOEXCEPT {
+        return *this;
+    }
+
+    ostream_joiner& operator++(int) BOOST_NOEXCEPT {
+        return *this;
+    }
+
+private:
+    ostream_type* output_;
+    Delim delim_;
+    bool first_;
+};
+
+#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && \
+    !defined(BOOST_NO_CXX11_HDR_TYPE_TRAITS)
+template<class Char, class Traits, class Delim>
+inline ostream_joiner<typename std::decay<Delim>::type, Char, Traits>
+make_ostream_joiner(std::basic_ostream<Char, Traits>& output, Delim&& delim)
+{
+    return ostream_joiner<typename std::decay<Delim>::type, Char,
+        Traits>(output, std::forward<Delim>(delim));
+}
+#else
+template<class Char, class Traits, class Delim>
+inline ostream_joiner<Delim, Char, Traits>
+make_ostream_joiner(std::basic_ostream<Char, Traits>& output,
+    const Delim& delim)
+{
+    return ostream_joiner<Delim, Char, Traits>(output, delim);
+}
+#endif
+
+} /* io */
+} /* boost */
+
+#endif