Operator overhaul

[Christopher Wright]

Stewart Gordon wrote:
> "Christopher Wright" <dhasenan at gmail.com> wrote in message 
> news:gei556$1sgc$3 at digitalmars.com...
> <snip>
>> I can never remember how the values for comparison work. An enum 
>> somewhere (except that's a new type, so just constants):
>>
>> struct Comparison
>> {
>> const int LeftIsGreater = -1;
>> const int Equal = 0;
>> const int RightIsGreater = 1;
>> }
>>
>> That's simple, it doesn't require any compiler changes, and it'll save 
>> me some headaches.
> 
> Enums are implicitly convertible to their underlying types, so there's 
> no point in using a struct instead.

I didn't realize that.

> If you're taking advantage of the ability to return an arbitrary int for 
> performance, are you planning to multiply by one of these constants?

This would mainly be for writing opCmp, and as documentation. As an 
alternative:

struct Comparison
{
	static Comparison LeftIsGreater = {-1};
	static Comparison Equal = {0};
	static Comparison RightIsGreater = {1};
	
	int value;
	bool opEquals(int i)
	{
		if (value == 0 && i == 0) return true;
		if (value < 0 && i < 0) return true;
		if (value > 0 && i > 0) return true;
		return false;
	}
}