EqualDataFunc

Description:

public delegate bool EqualDataFunc<T> (T a, T b)

A function comparing two object defining equivalence relationship.

In other words if `equal_to` is `EqualDataFunc` then:

It must be reflexive: for all objects `a` it holds that
`equal_to(a, a)`.
It must be symmetric: for all objects `a` and `b` if
`equal_to(a, b)` then `equal_to(b, a)`.
It must be transitive: if `equal_to(a, b)` and `equal_to(b, c)`
then `equal_to(a, c)`

Note:

The relationship must not change during lifetime of the delegate.

a	First value
b	Second value

Whether values are equal