VectorInt.Reverse Method

Overload List

#	Signature	Description
1	function Reverse: TVecInt;	Reverse vector elements.
	└ indexed: function Reverse(const Index: Integer; const Len: Integer): TMtxVecInt;
2	function Reverse(const Vec: TMtxVecInt): TVecInt;	Reverse all Vec elements.
	└ indexed: function Reverse(const Vec: TMtxVecInt; const VecIndex: Integer; const Index: Integer; const Len: Integer): TMtxVecInt;

Overload 1: function Reverse: TVecInt;

Reverse vector elements.

Result: stored in self (calling object), returns self for chaining

Remarks:

The method reverses vector elements by using the following equation:

\text{V}[k]=\text{Vec}[N-k],\quad 0\leq k \leq N, \quad \text{where } N=\text{Vec.Length}-1

This overload reverses all calling vector elements in-place.

Examples

var a: VectorInt;
begin
    a := [1,2,3,4];
    a.Reverse;   // a = [4,3,2,1]
end;

See Also: VectorInt.Rotate, VectorInt.Shift

Indexed: function Reverse(const Index: Integer; const Len: Integer): TMtxVecInt;

Reverses the calling object elements [Index]..[Index+Len-1].

#	Name	Type	Description
1	Index	Integer	start index
2	Len	Integer	element count

Result: stored in self (calling object), returns self for chaining

Remarks:

An exception is raised if array borders are overrun.

Overload 2: function Reverse(const Vec: TMtxVecInt): TVecInt;

Reverse all Vec elements.

#	Name	Type	Description
1	Vec	TMtxVecInt

Result: stored in self (calling object), returns self for chaining

Remarks:

Xtore the result in the calling vector elements. The TMtxVecBase.Length property of the calling vector is set to implicitly match Vec vector.

Indexed: function Reverse(const Vec: TMtxVecInt; const VecIndex: Integer; const Index: Integer; const Len: Integer): TMtxVecInt;

Reverse vector elements.

#	Name	Type	Description
1	Vec	TMtxVecInt
2	VecIndex	Integer
3	Index	Integer	start index
4	Len	Integer	element count

Result: stored in self (calling object), returns self for chaining

Remarks:

The method reverses Vec vector elements from [VecIndex].. [VecIndex+Len-1] and stores them in the calling vector from [Index]...[Index+Len-1] by using the following equation:

\text{V}[k]=\text{Vec}[N-k],\quad 0\leq k \leq N, \quad \text{where } N=\text{Vec.Length}-1

This overload reverses calling vector elements in-place.

Examples

var a: VectorInt;
begin
    a := [1,2,3,4];
    a.Reverse;   // a = [4,3,2,1]
end;

See Also: VectorInt.Rotate, VectorInt.Shift