java qr code reader library or you can use the lib pragma The equivalent of the preceding block would be in Objective-C

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or you can use the lib pragma The equivalent of the preceding block would be
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use lib LIST;
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Note that the directories are added before (using unshift) the standard directories to ensure that you use the local modules in preference to the standard ones For all directories added in this way, the lib module also checks that a $dir/$archname/auto exists, where $archname is the name of the architecture of the current platform If it does exist, it is assumed to be an architecture-specific directory and is actually added to @INC before the original directory specification Once added, it is not normally necessary to remove directories Furthermore, you shouldn t ever remove standard directories from the array It s also worth remembering that you may affect the future operation of a later module if you remove a directory that contains a module on which it relies Although you could argue that it is the module s responsibility to make sure it has access to the modules it needs, it s also sensible to assume that in the interests of good relations you shouldn t be removing directories anyway There is no advantage to removing them; it doesn t take a considerable amount of extra memory or processing power for the interpreter to search for what it s looking for With all this in mind, you remove directories with a no lib pragma, which removes the first instance of the named directory from @INC If you want to remove multiple instances, you will need to call no lib multiple times You can also remove all the specified names from @INC by specifying :ALL as the first parameter of no lib For example,
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no lib qw(:ALL );
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For each directory, the opposite of the earlier process is executed The architecture-specific directories are also searched for in the @INC array before they too are removed
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Although in practice you shouldn t need to, if you want to reinstate the original (standard) list of directories in @INC, you need to use
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@INC = @lib::ORIG_INC;
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locale
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The locale pragma tells the compiler to enable the use of POSIX locales for built-in operations This has the effect of enforcing the case conversion and pattern matching semantics according to the punctuation and characters used within the current setting The environment variables LC_CTYPE and LC_COLLATE should define the locale to be used for regular expression and string comparison respectively Note that it only applies where your system and C libraries are POSIX compliant
use locale;
The pragma is lexically scoped, so the effects are only felt until the end of the current block You can also use no to disable the effects
open
The open pragma works in conjunction with the open (and other) function to change the default character conversion discipline When used, any open or readpipe (such as backticks) operation within the current lexical scope will be subject to the defaults set For example
use open IN => "crlf", OUT => ":raw";
would set the input discipline to crlf and the output discipline to raw At the time of writing, these were the only two supported See 8 for more information on the disciplines used with open Also planned is a special :DEFAULT discipline, which can be specified to an open call to use the default values defined by the enclosing open pragma
The ops pragma switches off specific opcodes during the compilation process The synopsis is as follows,
perl -Mops=:default
which enables only reasonably safe operations, or you can specify that opcodes be removed from those available, using
19:
Controlling Execution with Pragmas
perl -M-ops=system
Note that the best way to use this option is via the command line incorporation; otherwise, you open yourself up to abuse before the compilation process starts through the use of BEGIN {} statements Alternatively, you can use the Safe and Opcode modules (see 15), which provide a more comprehensive method for executing Perl code using a restricted set of opcodes
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