Re: Pure opEquals in a class

[ag0aep6g via Digitalmars-d-learn]

On Monday, 20 August 2018 at 19:36:15 UTC, werter wrote:
The code below doesn't work. Is it possible to make a pure 
opEquals in a class?



[...]

pure bool opEquals(const A rhs) const
{
return b == rhs.b;
}


It doesn't work because `rhs` has the wrong type. It must be 
`Object`.


override pure bool opEquals(const Object rhs) const
{
const A a = cast(A) rhs;
return b == a.b;
}

Pure opEquals in a class

[werter via Digitalmars-d-learn]

The code below doesn't work. Is it possible to make a pure 
opEquals in a class?


void main()
{
class A
{
bool a;
int b;

this(bool g, int h)
{
a = g;
b = h;
}

pure bool opEquals(const A rhs) const
{
return b == rhs.b;  
}   
}

A a = new A(true, 5);
A b = new A(false, 5);

assert(a == b); //fails
}