/usr/include/casacore/tables/TaQL/TaQLNodeResult.h is in casacore-dev 2.2.0-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 | //# TaQLNodeResult.h: Classes holding the result of a node tree visit
//# Copyright (C) 2005
//# Associated Universities, Inc. Washington DC, USA.
//#
//# This library is free software; you can redistribute it and/or modify it
//# under the terms of the GNU Library General Public License as published by
//# the Free Software Foundation; either version 2 of the License, or (at your
//# option) any later version.
//#
//# This library 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 Library General Public
//# License for more details.
//#
//# You should have received a copy of the GNU Library General Public License
//# along with this library; if not, write to the Free Software Foundation,
//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
//#
//# Correspondence concerning AIPS++ should be addressed as follows:
//# Internet email: aips2-request@nrao.edu.
//# Postal address: AIPS++ Project Office
//# National Radio Astronomy Observatory
//# 520 Edgemont Road
//# Charlottesville, VA 22903-2475 USA
//#
//# $Id$
#ifndef TABLES_TAQLNODERESULT_H
#define TABLES_TAQLNODERESULT_H
//# Includes
#include <casacore/casa/aips.h>
namespace casacore { //# NAMESPACE CASACORE - BEGIN
// <summary>
// Abstract base class to hold the result of a visit to the node tree.
// </summary>
// <use visibility=local>
// <reviewed reviewer="" date="" tests="tTableGram">
// </reviewed>
// <prerequisite>
//# Classes you should understand before using this one.
// <li> <linkto class=TaQLNodeVisitor>TaQLNodeVisitor</linkto>
// <li> Note 199 describing
// <a href="../notes/199.html">
// TaQL</a>
// </prerequisite>
// <synopsis>
// TaQLNodeResultRep is the abstract base class for classes holding
// values filled by visitors to the raw TaQL parse tree. Visitors are
// classes derived from <linkto class=TaQLNodeVisitor>TaQLNodeVisitor</linkto>
// which traverse the parse tree.
// TaQLNodeResultRep is the counted referenced letter class in the envelope
// class <linkto class=TaQLNodeResult>TaQLNodeResult</linkto>.
// </synopsis>
class TaQLNodeResultRep
{
public:
// Default constructor clears the reference count.
// The count is updated by functions link and unlink.
TaQLNodeResultRep()
: itsCount(0) {}
// Destructor.
virtual ~TaQLNodeResultRep();
// Increment the reference count.
static TaQLNodeResultRep* link (TaQLNodeResultRep* rep)
{
if (rep) ++rep->itsCount;
return rep;
}
// Decrement the reference count.
// Delete the letter if no more references.
static void unlink (TaQLNodeResultRep* rep)
{
if (rep && --rep->itsCount == 0) delete rep;
}
private:
// Letter objects cannot be copied.
// <group>
TaQLNodeResultRep (const TaQLNodeResultRep&);
TaQLNodeResultRep& operator= (const TaQLNodeResultRep&);
// </group>
int itsCount;
};
// <summary>
// Envelope class to hold the result of a visit to the node tree.
// </summary>
// <use visibility=local>
// <reviewed reviewer="" date="" tests="tTableGram">
// </reviewed>
// <prerequisite>
//# Classes you should understand before using this one.
// <li> <linkto class=TaQLNodeVisitor>TaQLNodeVisitor</linkto>
// <li> Note 199 describing
// <a href="../notes/199.html">
// TaQL</a>
// </prerequisite>
// <synopsis>
// TaQLNodeResult is the envelope class for classes holding
// values filled by visitors to the raw TaQL parse tree. Visitors are
// classes derived from <linkto class=TaQLNodeVisitor>TaQLNodeVisitor</linkto>
// which traverse the parse tree.
// The counted referenced letter base class for the envelope is
// class <linkto class=TaQLNodeResultRep>TaQLNodeResultRep</linkto>.
// </synopsis>
class TaQLNodeResult
{
public:
// Default constructor has no letter.
TaQLNodeResult()
: itsRep(0) {}
// Take the given letter and increment its reference count.
TaQLNodeResult (TaQLNodeResultRep* rep)
{ itsRep = TaQLNodeResultRep::link (rep); }
// Copy constructor (reference semantics).
TaQLNodeResult (const TaQLNodeResult& that)
{ itsRep = TaQLNodeResultRep::link (that.itsRep); }
// Assignment (reference semantics).
TaQLNodeResult& operator= (const TaQLNodeResult& that)
{ if (this != &that) {
TaQLNodeResultRep::unlink (itsRep);
itsRep = TaQLNodeResultRep::link (that.itsRep);
}
return *this;
}
// Destructor decrements the reference count.
// The letter is deleted if no more references.
~TaQLNodeResult()
{ TaQLNodeResultRep::unlink (itsRep); }
// Does the envelope hold a letter?
Bool isValid() const
{ return itsRep; }
private:
TaQLNodeResultRep* itsRep;
public:
// Get the actual underlying object.
const TaQLNodeResultRep* getRep() const
{ return itsRep; }
};
} //# NAMESPACE CASACORE - END
#endif
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