elements.h

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//# elements.h: templates, classes and functions for "functional" programming, e.g. with STL iterators
//# with surrounding Gui functionality
//# Copyright (C) 2005,2009
//# 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: QtDisplayPanelGui.qo.h,v 1.7 2006/10/10 21:42:05 dking Exp $

#ifndef DISPLAY_FUNCTIONAL_ELEMENTS_H_
#define DISPLAY_FUNCTIONAL_ELEMENTS_H_
#include <math.h>

namespace casa { //# NAMESPACE CASA - BEGIN

        namespace viewer {

                // class for applying a range limit to values...
                template<typename T> class RangeLimiter {
                public:
                        // No-Op range limiter...
                        RangeLimiter( T (*mod)(T) = 0 ) : noop_(true), mod_(mod) { }
                        RangeLimiter( T min, T max, T (*mod)(T) = 0 ) : noop_(false), min_(min), max_(max), mod_(mod) { }
                        RangeLimiter( const RangeLimiter &other ) : noop_(other.noop_), min_(other.min_), max_(other.max_), mod_(other.mod_) { }
                        const RangeLimiter &operator=( const RangeLimiter &other ) {
                                noop_ = other.noop_;
                                min_ = other.min_;
                                max_ = other.max_;
                                mod_ = other.mod_;
                                return *this;
                        }
                        virtual T operator( )( T value ) {
                                return noop_ ? (mod_ ? (*mod_)(value) : value) : value < min_ ? min_ : value > max_ ? max_ : (mod_ ? (*mod_)(value) : value);
                        }
                        virtual ~RangeLimiter( ) { }
                private:
                        bool noop_;
                        T min_;
                        T max_;
                        T (*mod_)(T);
                };

                template<typename T,typename CT=std::vector<T> > class filter {
                public:
                        enum comparisons { EQUAL, UNEQUAL };
                        filter( T compare_element, comparisons c=UNEQUAL ) {
                                comparitor = compare_element;
                                if ( c == EQUAL ) op = &filter<T,CT>::equality;
                                else op = &filter<T,CT>::inequality;
                        }
                        void operator( )( T ele ) {
                                if ( (this->*op)(ele) ) cache.push_back(ele);
                        }
                        operator CT( ) { return cache; }
                        void clear( ) { cache.clear( ); }
                private:
                        T comparitor;
                        bool (filter<T,CT>::*op)(T);
                        bool equality( T ele ) { return ele == comparitor; }
                        bool inequality( T ele ) { return ele != comparitor; }
                        CT cache;
                };
                        

        }
}


#endif