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From: srwmrbd@windy.dsir.govt.nz (ROBERT)
Newsgroups: comp.lang.c++
Subject: Zortech bugs
Message-ID: <2118@windy.dsir.govt.nz>
Date: 1 Feb 89 16:01:38 GMT
Organization: DSIR, Wellington, NZ
Lines: 129

This is a list of examples of things we have found that don't work in
Zortech C++ (1.07) but do work in Advantage/Designer C++  1.2 (beta-2)
on a PC.


Automatic conversions (p174-5) - Compiler returns a bug message (11157) when
   a conversion is required if the conversion is explicitly requested, a
   syntax error if it is not.


#include <stream.hpp>

class APPLES
{
   int napples;
public:
   APPLES() { }
   APPLES(int n) { napples=n; }
   operator int() { return napples; }
};

class ORANGES
{
   int noranges;
public:
   ORANGES(int n) { noranges=n; }
   operator APPLES() { return APPLES(2*noranges); }
};

main()
{
   APPLES a; ORANGES o=7;
   a=(APPLES)o;                        // bug 11157 generated by this line
//   a=o;                              // syntax error generated by this line
   cout << (int)a;
}


A further conversion(?) problem:


#include <stream.hpp>

class A
{
   int data;
public:
   A(int i) { data=i; }
   friend ostream& operator<<( ostream&, A& );
   operator int() { return (int)data; }
};

ostream& operator<<(ostream& o, A& a) { o<<a.data; return o; }

main()
{
   A aa(2);
   cout << aa;                  // this line returns a syntax error
}


A further conversion(?) problem:


#include <stream.hpp>

class V
{
public:
   V(char *);
   friend ostream& operator<<(ostream&, V&);
};

class M : public V
{
public:
   M(char *);
   friend ostream& operator<<(ostream&, M&);
};

main()
{
   cout << "test";                       // syntax error on this line
}




A variety of errors when an 8087 is used with float. There is no problem
if one replaces float by double or disables the 8087.


#include <stream.hpp>

float square(float x)  { return x*x; }

main()
{
   extern int _8087;
   if (_8087) _control87(0x300,0x300);
   cout << "8087 code = " << _8087 << "\n";
//   _8087 = 0;
   float x0=0.00000000000000000000000000000000000001;
   cout << x0 <<" "<< x0*x0 <<" "<< square(x0) <<"\n";
   float x1=0.0000000000000000001;
   cout << x1 <<" "<< x1*x1 <<" "<< square(x1) <<"\n";
   float x2=0.0;
   cout << x2 <<" "<< x2*x2 <<" "<< square(x2) <<"\n";
   float x3=0.00001;
   cout << x3 <<" "<< x3*x3 <<" "<< square(x3) <<"\n";
}


Help file problem

I have all the Zortech files on drive D but carry out development on
drive C. I am unable to access online help from drive C.



Notes: Zortech C++ compiles about 3 times faster than Glockenspiel + MSC 5.1
on my test program and will also handle bigger projects. Speed and codefile
size seem similar if you use the -f flag for Zortech. So, at least at the
development stage of a project on a PC, it is much nicer to use Zortech than
Glockenspiel but it is also frustrating not knowing whether an error is one's
own or Zortech's.


Robert Davies