require "Text::CSV" is much different than require Text::CSV. For your code to work, you'd need to s-::-/-g on $module for the require (but not for the import).
You can also use a lexical. Note that my declarations happen when the statement is compiled but my initializations happen when the statement is run. So:
use strict;
my $module;
BEGIN {
$module= ... ? 'Text::CSV' : 'Text::CSV_XS';
my $file= $module;
$file =~ s-::-/-g;
require "$file.pm";
$module->import();
}
my $csv = $module->new();
Using eval "use $module" avoids this complication. Which to prefer is mostly a matter of taste (unless there is "risk" of $module ending up containing something strange).
- tye
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