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83 lines
2 KiB
C
83 lines
2 KiB
C
/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these libraries and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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// $XConsortium: VariableTable.cc /main/3 1996/06/11 17:09:55 cde-hal $
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//
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#include "Types.h"
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#include "VariableTable.h"
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static unsigned shash(const Symbol& key)
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{
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return key.hash();
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}
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VariableTable::VariableTable()
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: hashTable<Symbol,Expression>(shash)
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{
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}
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VariableTable::~VariableTable()
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{
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clearAndDestroy();
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}
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unsigned int
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VariableTable::exists(const Symbol &name) const
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{
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return contains(&name);
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}
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void
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VariableTable::enter(const Symbol &name, Expression *value)
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{
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Expression *exp = findValue(&name);
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if (exp)
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{
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Symbol *sym = remove(&name);
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delete sym ;
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delete exp ;
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}
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insertKeyAndValue(new Symbol(name), value);
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}
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const Expression &
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VariableTable::lookup(const Symbol &name) const
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{
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return *findValue(&name);
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}
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ostream &
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VariableTable::print(ostream &o) const
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{
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hashTableIterator<Symbol,Expression>
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next(*(hashTable<Symbol,Expression>*)this); // cast to
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// non-const
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while (++next)
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o << *next.key() << "\t" << *next.value() << endl;
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return o << endl;
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}
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ostream &operator <<(ostream &o, const VariableTable &v)
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{
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return v.print(o);
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}
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