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arfreg

arfreg(name,add,sub,mul,div,pwr,chsgn,comp)
:: Registers a set of fundamental operations for a type of structure.
return
1
name
string
add, sub, mul, div, pwr, chsgn, comp
user defined functions
% cat test
struct a {id,body}$

def add(A,B)
{
  C = newstruct(a);
  C->id = A->id; C->body = A->body+B->body;
  return C;
}

def sub(A,B)
{
  C = newstruct(a);
  C->id = A->id; C->body = A->body-B->body;
  return C;
}

def mul(A,B)
{
  C = newstruct(a);
  C->id = A->id; C->body = A->body*B->body;
  return C;
}

def div(A,B)
{
  C = newstruct(a);
  C->id = A->id; C->body = A->body/B->body;
  return C;
}

def pwr(A,B)
{
  C = newstruct(a);
  C->id = A->id; C->body = A->body^B;
  return C;
}

def chsgn(A)
{
  C = newstruct(a);
  C->id = A->id; C->body = -A->body;
  return C;
}

def comp(A,B)
{
  if ( A->body > B->body )
    return 1;
  else if ( A->body < B->body )
    return -1;
  else
    return 0;
}

arfreg("a",add,sub,mul,div,pwr,chsgn,comp)$
end$
% asir
This is Risa/Asir, Version 20000908.
Copyright (C) FUJITSU LABORATORIES LIMITED.
1994-2000. All rights reserved.
[0] load("./test")$
[11] A=newstruct(a);
{0,0}
[12] B=newstruct(a);
{0,0}
[13] A->body = 3;
3
[14] B->body = 4;
4
[15] A*B;
{0,12}
References
section newstruct, section structure definition


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