Hi,

I do not understand the following error message. I have template structure Decimal, which is used in a OrderDb structure.

Comparing two OrderDb structures is working, but trying to compare
two OrderDb array structures ends with an error message:
object.Error: TypeInfo.equals is not implemented.

Kind regards
André

--- Code ---

import std.traits: isInstanceOf;

struct Decimal(int precision, int scale){
	bool opEquals(T)(T d)
		if (isInstanceOf!(Decimal, T))
	{
		return false;
	}
}

struct OrderDb{
	string orderId;
	Decimal!(10,2) amount;
}

void main(){
	auto o1 = OrderDb();
	auto o2 = OrderDb();
	if (o1 == o2) {}; // Works
	if ([o1] == [o2]) {}; // object.Error: TypeInfo.equals is not implemented
}

opEquals should be const:

struct Decimal(int precision, int scale){
	bool opEquals(T)(T d) const
		if (isInstanceOf!(Decimal, T))
	{
		return false;
	}
}

Stanislav Blinov:

> opEquals should be const:
>
> struct Decimal(int precision, int scale){
> 	bool opEquals(T)(T d) const
> 		if (isInstanceOf!(Decimal, T))
> 	{
> 		return false;
> 	}
> }

DMD needs to give better error messages in such cases.

Bye,
bearophile

On Saturday, 8 February 2014 at 14:15:56 UTC, bearophile wrote:

> DMD needs to give better error messages in such cases.

Naturally. Especially since that was a runtime exception %\

Stanislav Blinov:

> Naturally. Especially since that was a runtime exception %\

Is this already in a bugzilla entry?

Bye,
bearophile

On Saturday, 8 February 2014 at 15:51:11 UTC, bearophile wrote:

> Is this already in a bugzilla entry?

Can't find anything similar. I'll reduce and post it.

https://d.puremagic.com/issues/show_bug.cgi?id=12108

Am 08.02.2014 17:14, schrieb Stanislav Blinov:
> https://d.puremagic.com/issues/show_bug.cgi?id=12108

Thanks a lot.

Kind regards
André