stream_base.h

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/** @file
 *  @author Bram de Greve (bramz@users.sourceforge.net)
 *  @author Tom De Muer (tomdemuer@users.sourceforge.net)
 *
 *  *** BEGIN LICENSE INFORMATION ***
 *  
 *  The contents of this file are subject to the Common Public Attribution License 
 *  Version 1.0 (the "License"); you may not use this file except in compliance with 
 *  the License. You may obtain a copy of the License at 
 *  http://lass.sourceforge.net/cpal-license. The License is based on the 
 *  Mozilla Public License Version 1.1 but Sections 14 and 15 have been added to cover 
 *  use of software over a computer network and provide for limited attribution for 
 *  the Original Developer. In addition, Exhibit A has been modified to be consistent 
 *  with Exhibit B.
 *  
 *  Software distributed under the License is distributed on an "AS IS" basis, WITHOUT 
 *  WARRANTY OF ANY KIND, either express or implied. See the License for the specific 
 *  language governing rights and limitations under the License.
 *  
 *  The Original Code is LASS - Library of Assembled Shared Sources.
 *  
 *  The Initial Developer of the Original Code is Bram de Greve and Tom De Muer.
 *  The Original Developer is the Initial Developer.
 *  
 *  All portions of the code written by the Initial Developer are:
 *  Copyright (C) 2004-2007 the Initial Developer.
 *  All Rights Reserved.
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 *
 *  Alternatively, the contents of this file may be used under the terms of the 
 *  GNU General Public License Version 2 or later (the GPL), in which case the 
 *  provisions of GPL are applicable instead of those above.  If you wish to allow use
 *  of your version of this file only under the terms of the GPL and not to allow 
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 *  
 *  *** END LICENSE INFORMATION ***
 */



/** @class lass::io::StreamBase
 *  @brief Base class for LASS streams with some state householding.
 *
 *  This class is only to provide functionality to whatever stream derives from it.
 *  You're not supposed to actually "use" it.  "use" it as in having StreamBase pointers
 *  or references floating in your code.  For that matter, the destructor of StreamBase
 *  is protected so life gets a bit troubled if you decide to try it anyway.
 */



#ifndef LASS_GUARDIAN_OF_INCLUSION_IO_STREAM_BASE_H
#define LASS_GUARDIAN_OF_INCLUSION_IO_STREAM_BASE_H



#include "io_common.h"
#include "../num/safe_bool.h"
#include "../util/non_copyable.h"
#include <cstdio>

namespace lass
{

namespace io
{

class LASS_DLL StreamBase: public util::NonCopyable
{
public:

    const bool good() const { return state_ == std::ios_base::goodbit; }
    const bool eof() const { return (state_ & std::ios_base::eofbit) != 0; }
    const bool fail() const { return (state_ & (std::ios_base::failbit | std::ios_base::badbit)) != 0; }
    const bool bad() const { return (state_ & std::ios_base::badbit) != 0; }
    std::ios_base::iostate rdstate() const { return state_; }
    void clear(std::ios_base::iostate iState = std::ios_base::goodbit) { state_ = iState; }
    void setstate(std::ios_base::iostate iState) { state_ |= iState; }
    operator num::SafeBool() const { return fail() ? num::safeFalse : num::safeTrue; }
    const bool operator!() const { return fail(); }

protected:

    StreamBase(): state_(std::ios_base::goodbit) {}
    ~StreamBase() {}

private:

    std::ios::iostate state_;
};

}

}

#endif