source: translator/ResolvExpr/Cost.h @ b87a5ed

#ifndef RESOLVEXPR_COST_H
#define RESOLVEXPR_COST_H

#include <iostream>

namespace ResolvExpr {
    class Cost {
      public:
        Cost();
        Cost( int unsafe, int poly, int safe );
  
        void incUnsafe( int inc = 1 );
        void incPoly( int inc = 1 );
        void incSafe( int inc = 1 );
  
        Cost operator+( const Cost &other ) const;
        Cost operator-( const Cost &other ) const;
        Cost &operator+=( const Cost &other );
        bool operator<( const Cost &other ) const;
        bool operator==( const Cost &other ) const;
        bool operator!=( const Cost &other ) const;
        friend std::ostream &operator<<( std::ostream &os, const Cost &cost );
  
        static const Cost zero;
        static const Cost infinity;
      private:
        int compare( const Cost &other ) const;

        int unsafe;
        int poly;
        int safe;
    };

    inline Cost::Cost() : unsafe( 0 ), poly( 0 ), safe( 0 ) {}

    inline Cost::Cost( int unsafe, int poly, int safe ) : unsafe( unsafe ), poly( poly ), safe( safe ) {}

    inline void 
        Cost::incUnsafe( int inc ) {
        unsafe += inc;
    }

    inline void 
        Cost::incPoly( int inc ) {
        unsafe += inc;
    }

    inline void 
        Cost::incSafe( int inc ) {
        unsafe += inc;
    }

    inline Cost Cost::operator+( const Cost &other ) const {
        return Cost( unsafe + other.unsafe, poly + other.poly, safe + other.safe );
    }

    inline Cost Cost::operator-( const Cost &other ) const {
        return Cost( unsafe - other.unsafe, poly - other.poly, safe - other.safe );
    }

    inline Cost &Cost::operator+=( const Cost &other ) {
        unsafe += other.unsafe;
        poly += other.poly;
        safe += other.safe;
        return *this;
    }

    inline bool Cost::operator<( const Cost &other ) const {
            if ( *this == infinity ) return false;
            if ( other == infinity ) return true;
            if ( unsafe > other.unsafe ) {
                return false;
            } else if ( unsafe < other.unsafe ) {
                return true;
            } else if ( poly > other.poly ) {
                return false;
            } else if ( poly < other.poly ) {
                return true;
            } else if ( safe > other.safe ) {
                return false;
            } else if ( safe < other.safe ) {
                return true;
            } else {
                return false;
            }
        }

    inline bool Cost::operator==( const Cost &other ) const {
        return unsafe == other.unsafe
        && poly == other.poly
        && safe == other.safe;
    }

    inline bool Cost::operator!=( const Cost &other ) const {
        return !( *this == other );
    }

    inline std::ostream &operator<<( std::ostream &os, const Cost &cost ) {
        os << "( " << cost.unsafe << ", " << cost.poly << ", " << cost.safe << " )";
        return os;
    }
} // namespace ResolvExpr

#endif // RESOLVEXPR_COST_H