A unix file descriptor streambuf for writing.

IOStreams/OutUnixFileBuf.h

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+static_assert( __cplusplus > 2020'99 );
+
+#pragma once
+
+#include <Alepha/Alepha.h>
+
+#include <unistd.h>
+
+#include <streambuf>
+
+namespace Alepha::Hydrogen::IOStreams  ::detail::  OutUnixFileBuf_m
+{
+	inline namespace exports
+	{
+		class OutUnixFileBuf;
+	}
+
+	class exports::OutUnixFileBuf
+		: virtual public std::streambuf
+	{
+		private:
+			int fd;
+
+			int
+			overflow( const int ch_ ) override
+			{
+				if( ch_ == EOF ) throw std::runtime_error{ "Unexpected EOF" };
+				const char ch= ch_;
+				xsputn( &ch, 1 );
+				return ch_;
+			}
+
+			std::streamsize
+			xsputn( const char *const data, const std::streamsize amt ) override
+			{
+				return ::write( fd, data, amt );
+			}
+
+		public:
+			explicit OutUnixFileBuf( const int fd ) : fd( fd ) {}
+	};
+}
+
+namespace Alepha::Hydrogen::IOStreams::inline exports::inline OutUnixFileBuf_m
+{
+	using namespace detail::OutUnixFileBuf_m::exports;
+}