107 lines
3.5 KiB
C++
107 lines
3.5 KiB
C++
/*
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Copyright (C) 2001-2006, William Joseph.
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All Rights Reserved.
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This file is part of GtkRadiant.
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GtkRadiant is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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GtkRadiant is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GtkRadiant; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#if !defined( INCLUDED_ITEXTSTREAM_H )
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#define INCLUDED_ITEXTSTREAM_H
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/// \file
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/// \brief Text-stream interfaces.
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#include <cstddef>
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#include "generic/static.h"
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/// \brief A read-only character-stream.
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class TextInputStream
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{
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public:
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/// \brief Attempts to read the next \p length characters from the stream to \p buffer.
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/// Returns the number of characters actually stored in \p buffer.
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virtual std::size_t read( char* buffer, std::size_t length ) = 0;
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};
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/// \brief A write-only character-stream.
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class TextOutputStream
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{
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public:
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/// \brief Attempts to write \p length characters to the stream from \p buffer.
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/// Returns the number of characters actually read from \p buffer.
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virtual std::size_t write( const char* buffer, std::size_t length ) = 0;
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};
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/// \brief Calls the overloaded function ostream_write() to perform text formatting specific to the type being written.
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/*! Note that ostream_write() is not globally defined - it must be defined once for each type supported.\n
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To support writing a custom type MyClass to any kind of text-output-stream with operator<<:
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\code
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template<typename TextOutputStreamType>
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TextOutputStreamType& ostream_write(TextOutputStreamType& ostream, const MyClass& myClass)
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{
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return ostream << myClass.getName() << ' ' << myClass.getText();
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}
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\endcode
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Expressing this as a template allows it to be used directly with any concrete text-output-stream type, not just the abstract TextOutputStream\n
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\n
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This overload writes a single character to any text-output-stream - ostream_write(TextOutputStreamType& ostream, char c).
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*/
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template<typename T>
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inline TextOutputStream& operator<<( TextOutputStream& ostream, const T& t ){
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return ostream_write( ostream, t );
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}
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class NullOutputStream : public TextOutputStream
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{
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public:
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std::size_t write( const char*, std::size_t length ){
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return length;
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}
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};
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class OutputStreamHolder
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{
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NullOutputStream m_nullOutputStream;
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TextOutputStream* m_outputStream;
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public:
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OutputStreamHolder()
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: m_outputStream( &m_nullOutputStream ){
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}
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void setOutputStream( TextOutputStream& outputStream ){
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m_outputStream = &outputStream;
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}
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TextOutputStream& getOutputStream(){
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return *m_outputStream;
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}
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};
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typedef Static<OutputStreamHolder> GlobalOutputStream;
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/// \brief Returns the global output stream. Used to display messages to the user.
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inline TextOutputStream& globalOutputStream(){
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return GlobalOutputStream::instance().getOutputStream();
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}
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class ErrorStreamHolder : public OutputStreamHolder {};
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typedef Static<ErrorStreamHolder> GlobalErrorStream;
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/// \brief Returns the global error stream. Used to display error messages to the user.
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inline TextOutputStream& globalErrorStream(){
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return GlobalErrorStream::instance().getOutputStream();
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}
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#endif
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