Initializing help system before first use

shiftargv

Purpose
Shift current positional program arguments.
Synopsis
procedure shiftargv(n: integer)
procedure shiftargv
Argument
n 
number of times to shift (default: 1)
Example
Consider the following model: 
model mycmd
uses 'deploy'

 writeln("My arguments:",argc)
 forall(i in 1..argc) write(argv(i)," ")
 writeln
 if argc>1 then
  shiftargv
  writeln("After shift:",argc)
  forall(i in 1..argc) write(argv(i)," ")
  writeln
 end-if
end-model
Executed with the following command: 
mosel exe mycmd.mos -- A B C
Will produce the following output: 
My arguments:4
mycmd A B C
After shift:3
mycmd B C
Further information
1. This procedure shifts the positional program argumenst by n positions starting from the second arguments ( i.e. argv(1) is not altered): argv(2) is replaced by argv(2+n), argv(3) is replaced by argv(3+n), ... and the last n arguments are removed.
2. The behaviour of this procedure is undefined if it is used by several models of the same instance concurrently as the program arguments are shared by all models of the instance.
Related topics
argc, argv
Module
deploy

Parent Topic Procedures and functions

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