Category : OS/2 Files
Archive : GPPDEV8F.ZIP
Filename : FIX.H
Output of file : FIX.H contained in archive : GPPDEV8F.ZIP
// Fix.h : variable length fixed point data type
//
#ifndef _Fix_h
#ifdef __GNUG__
#pragma interface
#endif
#define _Fix_h 1
#include
#include
#include
#include
#include
typedef unsigned short uint16;
typedef short int16;
typedef unsigned long uint32;
typedef long int32;
#define _Fix_min_length 1
#define _Fix_max_length 65535
#define _Fix_min_value -1.0
#define _Fix_max_value 1.0
extern uint16 Fix_default_length;
extern int Fix_default_print_width;
struct _Frep // internal Fix representation
{
uint16 len; // length in bits
uint16 siz; // allocated storage
int16 ref; // reference count
uint16 s[1]; // start of ushort array represention
};
typedef struct _Frep* _Fix;
extern _Frep _Frep_0;
extern _Frep _Frep_m1;
extern _Frep _Frep_quotient_bump;
class Fix
{
_Fix rep;
Fix(_Fix);
void unique();
public:
Fix();
Fix(Fix&);
Fix(double&);
Fix(int);
Fix(int, Fix&);
Fix(int, double&);
Fix(int, _Frep*);
~Fix();
Fix operator = (Fix&);
Fix operator = (double&);
friend int operator == (Fix&, Fix& );
friend int operator != (Fix&, Fix&);
friend int operator < (Fix&, Fix&);
friend int operator <= (Fix&, Fix&);
friend int operator > (Fix&, Fix&);
friend int operator >= (Fix&, Fix&);
Fix& operator + ();
Fix operator - ();
friend Fix operator + (Fix&, Fix&);
friend Fix operator - (Fix&, Fix&);
friend Fix operator * (Fix&, Fix&);
friend Fix operator / (Fix&, Fix&);
friend Fix operator * (Fix&, int);
friend Fix operator * (int, Fix&);
friend Fix operator % (Fix&, int);
friend Fix operator << (Fix&, int);
friend Fix operator >> (Fix&, int);
#ifdef __GNUG__
friend Fix operator friend Fix operator >? (Fix&, Fix&); // max
#endif
Fix operator += (Fix&);
Fix operator -= (Fix&);
Fix operator *= (Fix&);
Fix operator /= (Fix&);
Fix operator *= (int);
Fix operator %= (int);
Fix operator <<=(int);
Fix operator >>=(int);
friend char* Ftoa(Fix&, int width = Fix_default_print_width);
void printon(ostream&, int width = Fix_default_print_width);
friend Fix atoF(const char*, int len = Fix_default_length);
friend istream& operator >> (istream&, Fix&);
friend ostream& operator << (ostream&, Fix&);
// built-in functions
friend Fix abs(Fix); // absolute value
friend int sgn(Fix&); // -1, 0, +1
friend Integer mantissa(Fix&); // integer representation
friend double value(Fix&); // double value
friend int length(Fix&); // field length
friend void show(Fix&); // show contents
// error handlers
void error(const char* msg); // error handler
void range_error(const char* msg); // range error handler
// internal class functions
friend void mask(_Fix);
friend int compare(_Fix, _Fix = &_Frep_0);
friend _Fix new_Fix(uint16);
friend _Fix new_Fix(uint16, _Fix);
friend _Fix new_Fix(uint16, double);
friend _Fix copy(_Fix, _Fix);
friend _Fix negate(_Fix, _Fix = NULL);
friend _Fix add(_Fix, _Fix, _Fix = NULL);
friend _Fix subtract(_Fix, _Fix, _Fix = NULL);
friend _Fix multiply(_Fix, _Fix, _Fix = NULL);
friend _Fix multiply(_Fix, int, _Fix = NULL);
friend _Fix divide(_Fix, _Fix, _Fix = NULL, _Fix = NULL);
friend _Fix shift(_Fix, int, _Fix = NULL);
// non-operator versions for user
friend void negate(Fix& x, Fix& r);
friend void add(Fix& x, Fix& y, Fix& r);
friend void subtract(Fix& x, Fix& y, Fix& r);
friend void multiply(Fix& x, Fix& y, Fix& r);
friend void divide(Fix& x, Fix& y, Fix& q, Fix& r);
friend void shift(Fix& x, int y, Fix& r);
};
// error handlers
extern void
default_Fix_error_handler(const char*),
default_Fix_range_error_handler(const char*);
extern one_arg_error_handler_t
Fix_error_handler,
Fix_range_error_handler;
extern one_arg_error_handler_t
set_Fix_error_handler(one_arg_error_handler_t f),
set_Fix_range_error_handler(one_arg_error_handler_t f);
typedef void (*Fix_peh)(_Fix&);
extern Fix_peh Fix_overflow_handler;
extern void
Fix_overflow_saturate(_Fix&),
Fix_overflow_wrap(_Fix&),
Fix_overflow_warning_saturate(_Fix&),
Fix_overflow_warning(_Fix&),
Fix_overflow_error(_Fix&);
extern Fix_peh set_overflow_handler(Fix_peh);
extern int Fix_set_default_length(int);
// function definitions
inline void Fix::unique()
{
if ( rep->ref > 1 )
{
rep->ref--;
rep = new_Fix(rep->len,rep);
}
}
inline void mask (_Fix x)
{
int n = x->len & 0x0f;
if ( n )
x->s[x->siz - 1] &= 0xffff0000 >> n;
}
inline _Fix copy(_Fix from, _Fix to)
{
uint16 *ts = to->s, *fs = from->s;
int ilim = to->siz < from->siz ? to->siz : from->siz;
for ( int i=0; i < ilim; i++ )
*ts++ = *fs++;
for ( ; i < to->siz; i++ )
*ts++ = 0;
mask(to);
return to;
}
inline Fix::Fix(_Fix f)
{
rep = f;
}
inline Fix::Fix()
{
rep = new_Fix(Fix_default_length);
}
inline Fix::Fix(int len)
{
if ( len < _Fix_min_length || len > _Fix_max_length )
error("illegal length in declaration");
rep = new_Fix((uint16 )len);
}
inline Fix::Fix(double& d)
{
rep = new_Fix(Fix_default_length,d);
}
inline Fix::Fix(Fix& y)
{
rep = y.rep; rep->ref++;
}
inline Fix::Fix(int len, Fix& y)
{
if ( len < _Fix_min_length || len > _Fix_max_length )
error("illegal length in declaration");
rep = new_Fix((uint16 )len,y.rep);
}
inline Fix::Fix(int len, _Frep* fr)
{
if ( len < 1 || len > 65535 )
error("illegal length in declaration");
rep = new_Fix((uint16 )len,fr);
}
inline Fix::Fix(int len, double& d)
{
if ( len < _Fix_min_length || len > _Fix_max_length )
error("illegal length in declaration");
rep = new_Fix((uint16 )len,d);
}
inline Fix::~Fix()
{
if ( --rep->ref <= 0 ) delete rep;
}
inline Fix Fix::operator = (Fix& y)
{
if ( rep->len == y.rep->len ) {
++y.rep->ref;
if ( --rep->ref <= 0 ) delete rep;
rep = y.rep;
}
else {
unique();
copy(y.rep,rep);
}
return *this;
}
inline Fix Fix::operator = (double& d)
{
int oldlen = rep->len;
if ( --rep->ref <= 0 ) delete rep;
rep = new_Fix(oldlen,d);
return *this;
}
inline int operator == (Fix& x, Fix& y)
{
return compare(x.rep, y.rep) == 0;
}
inline int operator != (Fix& x, Fix& y)
{
return compare(x.rep, y.rep) != 0;
}
inline int operator < (Fix& x, Fix& y)
{
return compare(x.rep, y.rep) < 0;
}
inline int operator <= (Fix& x, Fix& y)
{
return compare(x.rep, y.rep) <= 0;
}
inline int operator > (Fix& x, Fix& y)
{
return compare(x.rep, y.rep) > 0;
}
inline int operator >= (Fix& x, Fix& y)
{
return compare(x.rep, y.rep) >= 0;
}
inline Fix& Fix::operator + ()
{
return *this;
}
inline Fix Fix::operator - ()
{
_Fix r = negate(rep); return r;
}
inline Fix operator + (Fix& x, Fix& y)
{
_Fix r = add(x.rep, y.rep); return r;
}
inline Fix operator - (Fix& x, Fix& y)
{
_Fix r = subtract(x.rep, y.rep); return r;
}
inline Fix operator * (Fix& x, Fix& y)
{
_Fix r = multiply(x.rep, y.rep); return r;
}
inline Fix operator * (Fix& x, int y)
{
_Fix r = multiply(x.rep, y); return r;
}
inline Fix operator * (int y, Fix& x)
{
_Fix r = multiply(x.rep, y); return r;
}
inline Fix operator / (Fix& x, Fix& y)
{
_Fix r = divide(x.rep, y.rep); return r;
}
inline Fix Fix::operator += (Fix& y)
{
unique(); add(rep, y.rep, rep); return *this;
}
inline Fix Fix::operator -= (Fix& y)
{
unique(); subtract(rep, y.rep, rep); return *this;
}
inline Fix Fix::operator *= (Fix& y)
{
unique(); multiply(rep, y.rep, rep); return *this;
}
inline Fix Fix::operator *= (int y)
{
unique(); multiply(rep, y, rep); return *this;
}
inline Fix Fix::operator /= (Fix& y)
{
unique(); divide(rep, y.rep, rep); return *this;
}
inline Fix operator % (Fix& x, int y)
{
Fix r((int )x.rep->len + y, x); return r;
}
inline Fix operator << (Fix& x, int y)
{
_Fix rep = shift(x.rep, y); return rep;
}
inline Fix operator >> (Fix& x, int y)
{
_Fix rep = shift(x.rep, -y); return rep;
}
inline Fix Fix::operator <<= (int y)
{
unique(); shift(rep, y, rep); return *this;
}
inline Fix Fix::operator >>= (int y)
{
unique(); shift(rep, -y, rep); return *this;
}
#ifdef __GNUG__
inline Fix operator {
if ( compare(x.rep, y.rep) <= 0 ) return x; else return y;
}
inline Fix operator >? (Fix& x, Fix& y)
{
if ( compare(x.rep, y.rep) >= 0 ) return x; else return y;
}
#endif
inline Fix abs(Fix x)
{
_Fix r = (compare(x.rep) >= 0 ? new_Fix(x.rep->len,x.rep) : negate(x.rep));
return r;
}
inline int sgn(Fix& x)
{
int a = compare(x.rep);
return a == 0 ? 0 : (a > 0 ? 1 : -1);
}
inline int length(Fix& x)
{
return x.rep->len;
}
inline ostream& operator << (ostream& s, Fix& y)
{
if (s.opfx())
y.printon(s);
return s;
}
inline void negate (Fix& x, Fix& r)
{
negate(x.rep, r.rep);
}
inline void add (Fix& x, Fix& y, Fix& r)
{
add(x.rep, y.rep, r.rep);
}
inline void subtract (Fix& x, Fix& y, Fix& r)
{
subtract(x.rep, y.rep, r.rep);
}
inline void multiply (Fix& x, Fix& y, Fix& r)
{
multiply(x.rep, y.rep, r.rep);
}
inline void divide (Fix& x, Fix& y, Fix& q, Fix& r)
{
divide(x.rep, y.rep, q.rep, r.rep);
}
inline void shift (Fix& x, int y, Fix& r)
{
shift(x.rep, y, r.rep);
}
#endif
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