AValue.h

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#ifndef OPAL_AValue_HH
#define OPAL_AValue_HH
 
// ------------------------------------------------------------------------
// $RCSfile: AValue.h,v $
// ------------------------------------------------------------------------
// $Revision: 1.1.1.1 $
// ------------------------------------------------------------------------
// Copyright: see Copyright.readme
// ------------------------------------------------------------------------
//
// Template class: AValue<T>
//
// ------------------------------------------------------------------------
//
// $Date: 2000/03/27 09:33:42 $
// $Author: Andreas Adelmann $
//
// ------------------------------------------------------------------------
 
#include "AbstractObjects/AttributeBase.h"
#include "Expressions/SConstant.h"
#include "Parser/Token.h"
#include <iosfwd>
#include <iostream>
#include <vector>
 
 
namespace Expressions {
 
    // Template class AValue
    // ----------------------------------------------------------------------
 
    template <class T> class AValue: public AttributeBase {
 
    public:
 
        //  Construct empty array.
        AValue();
 
        //  Use the vector of values.
        explicit AValue(const std::vector<T> &val);
 
        AValue(const AValue &);
        virtual ~AValue();
 
        virtual AValue *clone() const;
 
        //  Return the (already known) value.
        virtual std::vector<T> evaluate();
 
        virtual void print(std::ostream &) const;
 
    protected:
 
        mutable std::vector<T> value;
 
    private:
 
        // Not implemented.
        void operator=(const AValue<T> &);
    };
 
 
    // Implementation
    // ----------------------------------------------------------------------
 
    template <class T>
    AValue<T>::AValue():
        value()
    {}
 
 
    template <class T>
    AValue<T>::AValue(const AValue<T> &rhs):
        value(rhs.value)
    {}
 
 
    template <class T>
    AValue<T>::AValue(const std::vector<T> &val):
        value(val)
    {}
 
 
    template <class T>
    AValue<T>::~AValue()
    {}
 
 
    template <class T>
    AValue<T> *AValue<T>::clone() const {
        return new AValue<T>(value);
    }
 
 
    template <class T>
    std::vector<T> AValue<T>::evaluate() {
        return value;
    }
 
 
    // Print methods are specialised.
    // ------------------------------------------------------------------------
 
    template<> inline
    void AValue<bool>::print(std::ostream &os) const {
        os << '{';
        std::vector<bool>::const_iterator i = value.begin();
 
        while(i != value.end()) {
            os << (*i ? "TRUE" : "FALSE");
            if(++i == value.end()) break;
            os << ',';
        }
 
        os << '}';
        return;
    }
 
 
    template<> inline
    void AValue<double>::print(std::ostream &os) const {
        std::streamsize old_prec = os.precision(12);
        os << '{';
        std::vector<double>::const_iterator i = value.begin();
 
        while(i != value.end()) {
            os << *i;
            if(++i == value.end()) break;
            os << ',';
        }
 
        os << '}';
        os.precision(old_prec);
        return;
    }
 
 
    template<> inline
    void AValue<std::string>::print(std::ostream &os) const {
        os << '{';
        std::vector<std::string>::const_iterator i = value.begin();
 
        while(i != value.end()) {
            os << '"' << *i << '"';
            if(++i == value.end()) break;
            os << ',';
        }
 
        os << '}';
        return;
    }
 
 
    template<> inline
    void AValue<std::list<Token> >::print(std::ostream &os) const {
        os << '{';
        std::vector<std::list<Token> >::const_iterator i = value.begin();
 
        while(i != value.end()) {
            for(std::list<Token>::const_iterator j = i->begin();
                j != i->end(); ++j) {
                os << *j;
            }
 
            if(++i == value.end()) break;
            os << ',';
        }
 
        os << '}';
        return;
    }
 
}
 
#endif // OPAL_AValue_HH