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Programming-Idioms

  • Smalltalk
  • Perl

Idiom #144 Check if file exists

Set boolean b to true if file at path fp exists on filesystem; false otherwise.

Beware that you should not do this and then in the next instruction assume the result is still valid, this is a race condition on any multitasking OS.

my $b = -f $fp;

_-f is the stat operator that checks for the existence of a file.
with Ada.Directories;
B : constant Boolean := Ada.Directories.Exists (FP);

New implementation...
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