• z gg.com (31/31) Aug 10 2005 dmd 129:
• zwang (2/43) Aug 10 2005
• Niko Korhonen (8/9) Aug 11 2005 ...and I think it should be a compiler warning trying to define only
• z gg.com (1/3) Aug 11 2005 Does D support covariant argument type for class method?

z gg.com writes:

dmd 129:

sortbug.exe
1.000000 3.000000 2.000000
2.000000 3.000000 1.000000


sortbug.d
------------------------------------------
class A {
public:
float value;

this(float v) {value=v;}

int opCmp(A o) {
if (this.value < o.value)  return -1;
if (this.value > o.value)  return  1;
return 0;
}

}
int main(char[][] args)
{
int i;
A[3] arr;

arr[0] = new A(1.0);
arr[1] = new A(3.0);
arr[2] = new A(2.0);
for (i=0; i<3; i++) { printf("%f ", arr[i].value); }
printf("\n");
arr.sort;
for (i=0; i<3; i++) { printf("%f ", arr[i].value); }
printf("\n");

return 0;
}
------------------------------------------

zwang <nehzgnaw gmail.com> writes:

You need to define int opCmp(Object o){ ... }

z gg.com wrote:
 dmd 129:
 
 sortbug.exe
 1.000000 3.000000 2.000000
 2.000000 3.000000 1.000000
 
 
 sortbug.d
 ------------------------------------------
 class A {
 public:
 float value;
 
 this(float v) {value=v;}
 
 int opCmp(A o) {
 if (this.value < o.value)  return -1;
 if (this.value > o.value)  return  1;
 return 0;
 }
 
 }
 int main(char[][] args)
 {
 int i;
 A[3] arr;
 
 arr[0] = new A(1.0);
 arr[1] = new A(3.0);
 arr[2] = new A(2.0);
 for (i=0; i<3; i++) { printf("%f ", arr[i].value); }
 printf("\n");
 arr.sort;
 for (i=0; i<3; i++) { printf("%f ", arr[i].value); }
 printf("\n");
 
 return 0;
 }
 ------------------------------------------
 
 

Niko Korhonen <niktheblak hotmail.com> writes:

zwang wrote:
 You need to define int opCmp(Object o){ ... }

...and I think it should be a compiler warning trying to define only 
opCmp(MyObj) without defining opCmp(Object) for objects. It would save 
us from so much hassle.

The same thing for not defining toHash when defininng opEquals and so forth.

-- 
Niko Korhonen
SW Developer

z gg.com writes:

zwang wrote:
 You need to define int opCmp(Object o){ ... }


Does D support covariant argument type for class method?