IFstream.H

Go to the documentation of this file.

/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
   \\    /   O peration     |
    \\  /    A nd           | www.openfoam.com
     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2011 OpenFOAM Foundation
    Copyright (C) 2017-2020 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
Class
    Foam::IFstream
 
Description
    Input from file stream, using an ISstream
 
SourceFiles
    IFstream.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef IFstream_H
#define IFstream_H
 
#include "ISstream.H"
#include "fileName.H"
#include "className.H"
#include <fstream>
#include <memory>
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
namespace Detail
{
 
/*---------------------------------------------------------------------------*\
                  Class Detail::IFstreamAllocator Declaration
\*---------------------------------------------------------------------------*/
 
//- A std::istream with the ability to handle compressed files
class IFstreamAllocator
{
protected:
 
    // Member Data
 
        //- The allocated stream pointer (ifstream or igzstream).
        std::unique_ptr<std::istream> allocatedPtr_;
 
        //- The detected compression type
        IOstream::compressionType detectedCompression_;
 
 
    // Constructors
 
        //- Construct from pathname
        IFstreamAllocator(const fileName& pathname);
};
 
} // End namespace Detail
 
 
/*---------------------------------------------------------------------------*\
                          Class IFstream Declaration
\*---------------------------------------------------------------------------*/
 
class IFstream
:
    public Detail::IFstreamAllocator,
    public ISstream
{
public:
 
    //- Declare type-name (with debug switch)
    ClassName("IFstream");
 
 
    // Constructors
 
        //- Construct from pathname
        explicit IFstream
        (
            const fileName& pathname,
            IOstreamOption streamOpt = IOstreamOption()
        );
 
        //- Construct from pathname, format (version)
        IFstream
        (
            const fileName& pathname,
            streamFormat fmt,
            versionNumber ver = currentVersion
        )
        :
            IFstream(pathname, IOstreamOption(fmt, ver))
        {}
 
 
    //- Destructor
    ~IFstream() = default;
 
 
    // Member Functions
 
    // Access
 
        //- Read/write access to the name of the stream
        using ISstream::name;
 
 
    // STL stream
 
        //- Access to underlying std::istream
        virtual std::istream& stdStream();
 
        //- Const access to underlying std::istream
        virtual const std::istream& stdStream() const;
 
        //- Rewind the stream so that it may be read again
        virtual void rewind();
 
 
    // Print
 
        //- Print stream description to Ostream
        virtual void print(Ostream& os) const;
 
 
    // Member Operators
 
        //- Return a non-const reference to const IFstream
        //  Needed for read-constructors where the stream argument is temporary:
        //  e.g. thing thisThing(IFstream("fileName")());
        IFstream& operator()() const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //