PtrListIO.C

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/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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     \\/     M anipulation  |
-------------------------------------------------------------------------------
    Copyright (C) 2011-2016 OpenFOAM Foundation
    Copyright (C) 2018-2021 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/>.
 
\*---------------------------------------------------------------------------*/
 
#include "PtrList.H"
#include "SLList.H"
#include "Istream.H"
#include "INew.H"
 
// * * * * * * * * * * * * Private Member Functions  * * * * * * * * * * * * //
 
template<class T>
template<class INew>
void Foam::PtrList<T>::readIstream(Istream& is, const INew& inew)
{
    clear();  // Delete old pointers and reset the list size
 
    is.fatalCheck(FUNCTION_NAME);
 
    token tok(is);
 
    is.fatalCheck("PtrList::readIstream : reading first token");
 
    if (tok.isLabel())
    {
        // Label: could be int(..), int{...} or just a plain '0'
 
        // Read size of list
        const label len = tok.labelToken();
 
        // Set list length to that read
        resize(len);
 
        // Read beginning of contents
        const char delimiter = is.readBeginList("PtrList");
 
        if (len)
        {
            if (delimiter == token::BEGIN_LIST)
            {
                for (label i=0; i<len; ++i)
                {
                    T* p = inew(is).ptr();
                    set(i, p);
 
                    is.fatalCheck
                    (
                        "PtrList::readIstream : "
                        "reading entry"
                    );
                }
            }
            else  // Assumed to be BEGIN_BLOCK
            {
                T* p = inew(is).ptr();
                set(0, p);
 
                is.fatalCheck
                (
                    "PtrList::readIstream : "
                    "reading the single entry"
                );
 
                for (label i=1; i<len; ++i)
                {
                    set(i, p->clone());
                }
            }
        }
 
        // Read end of contents
        is.readEndList("PtrList");
    }
    else if (tok.isPunctuation(token::BEGIN_LIST))
    {
        // "(...)" : read as SLList and transfer contents
        // This would be more efficient (fewer allocations, lower overhead)
        // using a DynamicList, but then we have circular dependencies
 
        SLList<T*> slList;
 
        is >> tok;
        while (!tok.isPunctuation(token::END_LIST))
        {
            is.putBack(tok);
 
            if (is.eof())
            {
                FatalIOErrorInFunction(is)
                    << "Premature EOF after reading " << tok.info() << nl
                    << exit(FatalIOError);
            }
 
            slList.append(inew(is).ptr());
            is >> tok;
        }
 
        resize(slList.size());
 
        // A list of pointers - can simply shallow copy them
        label i = 0;
        for (T* ptr : slList)
        {
            set(i++, ptr);
        }
    }
    else
    {
        FatalIOErrorInFunction(is)
            << "incorrect first token, expected <int> or '(', found "
            << tok.info() << nl
            << exit(FatalIOError);
    }
}
 
 
// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //
 
template<class T>
template<class INew>
Foam::PtrList<T>::PtrList(Istream& is, const INew& inew)
{
    this->readIstream(is, inew);
}
 
 
template<class T>
Foam::PtrList<T>::PtrList(Istream& is)
{
    this->readIstream(is, INew<T>());
}
 
 
// * * * * * * * * * * * * * * * Istream Operator  * * * * * * * * * * * * * //
 
template<class T>
Foam::Istream& Foam::operator>>(Istream& is, PtrList<T>& list)
{
    list.readIstream(is, INew<T>());
    return is;
}
 
 
// ************************************************************************* //