This is a new site that's currently running on alpha code. There are going to be bugs. If you discover any, please report them on the site's issues page (GitHub account required). Thanks.
Warning: Many URLs are going to change. Refer to the README file to discover which library project's documentation has been completed.
Project: Array Utilities Unit
Applies to: ~>0.1
This page contains brief descriptions of the Delphi run time library types used by TArrayUtils methods.
Unit: System.Generics.Defaults
type
TComparison<T> = reference to function(const Left, Right: T): Integer;
A function of this type can be passed to various TArrayUtils methods that compare values of type T.
The function must be implemented to return 0
if Left = Right, a negative value if Left < Right and a positive value if Left > Right.
Unit: System.Generics.Defaults
type
TEqualityComparison<T> = reference to function(const Left, Right: T): Boolean;
A function of this type can be passed to various TArrayUtils methods that test values of type T for equality.
The function must be implemented to return True
if Left = Right or False
if Left ≠ Right.
Unit: System.Generics.Defaults
type
IComparer<T> = interface
function Compare(const Left, Right: T): Integer;
end;
An instance of an object supporting this interface can be passed to various TArrayUtils methods that compare values of type T.
The Compare method must be implemented to return 0
if Left = Right, a negative value if Left < Right and a positive value if Left > Right.
Unit: System.Generics.Defaults
type
IEqualityComparer<T> = interface
function Equals(const Left, Right: T): Boolean;
function GetHashCode(const Value: T): Integer;
end;
An instance of an object supporting this interface can be passed to various TArrayUtils methods that test values of type T for equality.
The Equals method must be implemented to return True
if Left = Right or False
if Left ≠ Right.
The Hash method is not used by any TArrayUtils method, and so the quality of the returned hash code does not matter. In circumstances where it is certain that the Hash method will never be called then 0
can be returned.
Unit: System.Generics.Defaults
class function TComparer<T>.Default: IComparer<T>;
This method returns an instance of the default comparer for type T.
It is used by TArrayUtils whenever an optional comparer object or function is not provided by the user.
Unit: System.Generics.Defaults
class function TEqualityComparer<T>.Default: IEqualityComparer<T>;
This method returns an instance of the default equality comparer for type T.
It is used by TArrayUtils whenever an optional equality comparer object or function is not provided by the user.