整理

include/boost/io/ostream_put.hpp

@@ -0,0 +1,50 @@
+/*
+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_PUT_HPP
+#define BOOST_IO_OSTREAM_PUT_HPP
+
+#include <boost/io/detail/buffer_fill.hpp>
+#include <boost/io/detail/ostream_guard.hpp>
+
+namespace boost {
+namespace io {
+
+template<class charT, class traits>
+inline std::basic_ostream<charT, traits>&
+ostream_put(std::basic_ostream<charT, traits>& os, const charT* data,
+    std::size_t size)
+{
+    typedef std::basic_ostream<charT, traits> stream;
+    detail::ostream_guard<charT, traits> guard(os);
+    typename stream::sentry entry(os);
+    if (entry) {
+        std::basic_streambuf<charT, traits>& buf = *os.rdbuf();
+        std::size_t width = static_cast<std::size_t>(os.width());
+        if (width <= size) {
+            if (static_cast<std::size_t>(buf.sputn(data, size)) != size) {
+                return os;
+            }
+        } else if ((os.flags() & stream::adjustfield) == stream::left) {
+            if (static_cast<std::size_t>(buf.sputn(data, size)) != size ||
+                !detail::buffer_fill(buf, os.fill(), width - size)) {
+                return os;
+            }
+        } else if (!detail::buffer_fill(buf, os.fill(), width - size) ||
+            static_cast<std::size_t>(buf.sputn(data, size)) != size) {
+            return os;
+        }
+        os.width(0);
+    }
+    guard.release();
+    return os;
+}
+
+} /* io */
+} /* boost */
+
+#endif