Flag in macros. Help to solve.

Roman,

Do you want to check whether Loo macroinstruction is invoked first time? It can be done several ways:

Code:

; Using symbolic constant
macro Loo x {
  match =_Loo, _Loo \{
  ; seems that '_Loo' is undefined, let's do it
  \local ..Loo, ..Loo0
        jmp     ..Loo0
..Loo:  invoke  MessageBox, 0, eax, 0, 0
        ret
..Loo0:
    _Loo equ ..Loo; now it's defined
  \}
        mov     eax, x
        call    _Loo; here '_Loo' is defined properly in any case
}


; Using numeric constant
macro Loo x {
local ..Loo, ..Loo0
  if ~defined _Loo
        jmp     ..Loo0
..Loo:  invoke  MessageBox, 0, eax, 0, 0
        ret
..Loo0:
    _Loo = ..Loo
  end if
  _Loo = _Loo; make it out of scope above
        mov     eax, x
        call    _Loo
}

They're quite similar: symbolic one is straightforward, numeric uses defined operator to check if _Loo constant is defined before (because redefinition makes it inaccessible from above).

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