minprim.cpp

#include "xtended.hh"
#include "Text.hh"
#include <math.h>
#include "sigtyperules.hh"

class MinPrim : public xtended
{

 public:
 
    MinPrim() : xtended("min") {}
    
    virtual unsigned int arity () { return 2; }
    
    virtual bool    needCache ()    { return true; }
    
    virtual Type    infereSigType (const vector<Type>& types)
    {
        assert (types.size() == arity());
        interval i = types[0]->getInterval();
        interval j = types[1]->getInterval();
        return castInterval(types[0]|types[1], min(i,j));
    }
    
    virtual void    sigVisit (Tree sig, sigvisitor* visitor) {} 
    
    virtual int infereSigOrder (const vector<int>& args) 
    {
        assert (args.size() == arity());
        return max(args[0], args[1]);
    }

    
    virtual Tree    computeSigOutput (const vector<Tree>& args) 
    {
        float f,g; int i,j;
        
        assert (args.size() == arity());
        
        if (isFloat(args[0]->node(),&f)) {
        
            if (isFloat(args[1]->node(), &g)) {
                return tree(min(f, g));
            } else if (isInt(args[1]->node(),&j)) {
                return tree(min(f, float(j)));
            } else {
                return tree(symbol(), args[0], args[1]);
            }
                
        } else if (isInt(args[0]->node(),&i)) {
        
            if (isFloat(args[1]->node(), &g)) {
                return tree(min(float(i), g));
            } else if (isInt(args[1]->node(),&j)) {
                return tree(min(i, j));
            } else {
                return tree(symbol(), args[0], args[1]);
            }
                
        } else {
        
            return tree(symbol(), args[0], args[1]);
        }
    }
        
    virtual string  generateCode (Klass* klass, const vector<string>& args, const vector<Type>& types)
    {
        assert (args.size() == arity());
        assert (types.size() == arity());
        
        Type t = infereSigType(types);
        if (t->nature() == kReal) {
            return subst("min($0, $1)", args[0], args[1]);
        } else {
            return subst("min($0, $1)", args[0], args[1]);
        }           
    }
    
};


xtended* gMinPrim = new MinPrim();

---