Equivalent of PB SWAP statement

[Chris Chancellor]

Hello Charles

PB has a swap statements which swap the values between 2 variables, what would be
the equivalent O2 statement ?

Please see
http://manmrk.net/tutorials/basic/PowerBASIC/pbcc5/swap_statement.htm

Thanxx

[Eduardo Jorge]

I think charles has already put an example of this in an answer to Mike
I believe it would be using pointer and swapping addresses with @
I think it would be something like this
A ,B
*P
@P=@A
@A=@B
@B=@P
in case instead of values exchange memory addresses

[Charles Pegge]

Hi Chris and Eduardo,

This will work for any primitive type, or flat UDT

Code Select Expand


  macro Swap(a,b,    c)
  =====================
  typeof(a) c=a
  a=b
  b=c
  end macro

  int a=1, b=2
  swap a,b


[Chris Chancellor]

Thanxx a lot both of you

this O2 Swap macro is even better than PB Swap,  bcos  PB Swap statement will require the same type of primitives
for the 2 variables a and b