• rumbu (19/19) Jan 29 2015 bool opEquals(Object obj, int value)
• "Marc =?UTF-8?B?U2Now7x0eiI=?= <schuetzm gmx.net> (3/22) Jan 29 2015 UFCS is not used when operators are involved. I think this is
• =?UTF-8?B?QWxpIMOHZWhyZWxp?= (17/34) Jan 29 2015 In D, operator overloading is only for user-defined types and through

"rumbu" <rumbu rumbu.ro> writes:

bool opEquals(Object obj, int value)
{
     //do something to compare them
     return false;
}


void main(string[] args)
{
     Object obj;
     if (obj == 12) {}
     //ERROR function object.Object.opEquals (Object o) is not 
callable using argument types (int)	
}

According to paragraph (2) - 
http://dlang.org/operatoroverloading.html#eqcmp), the compiler 
must try obj.opEquals(12) and 12.opEquals(obj) but this is not 
happening.

Is there any other way to overload the equality operator? (except 
overriding opEquals in each class intended to be compared with an 
integer)

"Marc =?UTF-8?B?U2Now7x0eiI=?= <schuetzm gmx.net> writes:

On Thursday, 29 January 2015 at 17:48:04 UTC, rumbu wrote:
 bool opEquals(Object obj, int value)
 {
     //do something to compare them
     return false;
 }


 void main(string[] args)
 {
     Object obj;
     if (obj == 12) {}
     //ERROR function object.Object.opEquals (Object o) is not 
 callable using argument types (int)	
 }

 According to paragraph (2) - 
 http://dlang.org/operatoroverloading.html#eqcmp), the compiler 
 must try obj.opEquals(12) and 12.opEquals(obj) but this is not 
 happening.

 Is there any other way to overload the equality operator? 
 (except overriding opEquals in each class intended to be 
 compared with an integer)

UFCS is not used when operators are involved. I think this is 
intentional.

=?UTF-8?B?QWxpIMOHZWhyZWxp?= <acehreli yahoo.com> writes:

On 01/29/2015 09:48 AM, rumbu wrote:
 bool opEquals(Object obj, int value)
 {
      //do something to compare them
      return false;
 }


 void main(string[] args)
 {
      Object obj;
      if (obj == 12) {}
      //ERROR function object.Object.opEquals (Object o) is not callable
 using argument types (int)
 }

 According to paragraph (2) -
 http://dlang.org/operatoroverloading.html#eqcmp), the compiler must try
 obj.opEquals(12) and 12.opEquals(obj) but this is not happening.

 Is there any other way to overload the equality operator? (except
 overriding opEquals in each class intended to be compared with an integer)

In D, operator overloading is only for user-defined types and through 
their member functions.

class C
{
     int value;

     bool opEquals(int value)
     {
         return value == this.value;
     }
}

void main(string[] args)
{
     auto c = new C;
     if (c == 12) {}
}

Ali