整理

include/boost/io/detail/buffer_fill.hpp

@@ -0,0 +1,39 @@
+/*
+Copyright 2019-2020 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_DETAIL_BUFFER_FILL_HPP
+#define BOOST_IO_DETAIL_BUFFER_FILL_HPP
+
+#include <iosfwd>
+#include <cstddef>
+
+namespace boost {
+namespace io {
+namespace detail {
+
+template<class charT, class traits>
+inline bool
+buffer_fill(std::basic_streambuf<charT, traits>& buf, charT ch,
+    std::size_t size)
+{
+    charT fill[] = { ch, ch, ch, ch, ch, ch, ch, ch };
+    enum {
+        chunk = sizeof fill / sizeof(charT)
+    };
+    for (; size > chunk; size -= chunk) {
+        if (static_cast<std::size_t>(buf.sputn(fill, chunk)) != chunk) {
+            return false;
+        }
+    }
+    return static_cast<std::size_t>(buf.sputn(fill, size)) == size;
+}
+
+} /* detail */
+} /* io */
+} /* boost */
+
+#endif

include/boost/io/detail/ostream_guard.hpp

@@ -0,0 +1,45 @@
+/*
+Copyright 2019-2020 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_DETAIL_OSTREAM_GUARD_HPP
+#define BOOST_IO_DETAIL_OSTREAM_GUARD_HPP
+
+#include <boost/config.hpp>
+#include <iosfwd>
+
+namespace boost {
+namespace io {
+namespace detail {
+
+template<class Char, class Traits>
+class ostream_guard {
+public:
+    explicit ostream_guard(std::basic_ostream<Char, Traits>& os) BOOST_NOEXCEPT
+        : os_(&os) { }
+
+    ~ostream_guard() BOOST_NOEXCEPT_IF(false) {
+        if (os_) {
+            os_->setstate(std::basic_ostream<Char, Traits>::badbit);
+        }
+    }
+
+    void release() BOOST_NOEXCEPT {
+        os_ = 0;
+    }
+
+private:
+    ostream_guard(const ostream_guard&);
+    ostream_guard& operator=(const ostream_guard&);
+
+    std::basic_ostream<Char, Traits>* os_;
+};
+
+} /* detail */
+} /* io */
+} /* boost */
+
+#endif