logo
down
shadow

Error in conditionally including Perl module using if pragma


Error in conditionally including Perl module using if pragma

By : M Prasad Reddy
Date : November 22 2020, 02:59 PM
This might help you Assignment to variables happens at run time, while use happens at compile time. So in your example, $a has not been assigned any value when the use happens, so it evaluates to undef.
To assign to $a at compile time, use BEGIN:
code :
my $a;
BEGIN { $a = 1 }
use if ($a), 'x86_64-linux-thread-multi::Devel::Cover::DB::IO::JSON';


Share : facebook icon twitter icon
How do I conditionally use a Perl module only if I'm on Windows?

How do I conditionally use a Perl module only if I'm on Windows?


By : user1460644
Date : March 29 2020, 07:55 AM
like below fixes the issue This code will work in all situations, and also performs the load at compile-time, as other modules you are building might depend on it:
code :
BEGIN {
    if ($^O eq "MSWin32")
    {
        require Module;
        Module->import();  # assuming you would not be passing arguments to "use Module"
    }
}
use if $^O eq "MSWin32", Module;
How can I conditionally use a module in Perl?

How can I conditionally use a module in Perl?


By : Brandon T
Date : March 29 2020, 07:55 AM
I hope this helps . You might find the if module useful for this.
Otherwise the basic idea is to use require, which happens at run-time, instead of use, which happens at compile-time. Note that '
code :
BEGIN {
    my $module = $condition ? $Module1 : $Module2;
    my $file = $module;
    $file =~ s[::][/]g;
    $file .= '.pm';
    require $file;
    $module->import;
}
my @array = do {
    no strict 'refs';
    @{ ${ "${Module}::Array_inside_module" } };
};
Error while conditionally using perl module

Error while conditionally using perl module


By : Satish Sharma
Date : March 29 2020, 07:55 AM
it fixes the issue To conditionally include a module, use the if pragma
code :
use if ($x == $y), 'IO::Compress::Gzip' => qw(gzip);
if ($x == $y) {
    require IO::Compress::Gzip;
    IO::Compress::Gzip->import('gzip');
}
Perl: How can I inject the UTF-8 pragma in a boilerplate module?

Perl: How can I inject the UTF-8 pragma in a boilerplate module?


By : MBronoso
Date : March 29 2020, 07:55 AM
I hope this helps . I have a Perl boilerplate module similar to common::sense or Modern::Perl. It's roughly a rip off of Modern::Perl. It looks like this (shortened to keep this question concise): , Works for me.
code :
$ cat Prologue.pm
package Prologue;
require utf8;
sub import { utf8->import }
1;

$ cat a.pl
$_ = "é";
CORE::say(sprintf("%vX", $_));
use Prologue;
$_ = "é";
CORE::say(sprintf("%vX", $_));

$ perl a.pl
C3.A9
E9
Conditionally including a module in perl

Conditionally including a module in perl


By : shruti
Date : March 29 2020, 07:55 AM
Any of those help This is because use statements are executed at compile time, while your assignment is performed at run time and hasn't been executed yet
You can fix this by using a BEGIN block to do the assigmment at compile time as well, like this. Note that the variable must be declared outside the block, otherwise it will be local to the block and will disappear before it is neded
code :
my $condition;
BEGIN {
    $condition = 1;
}

use if $condition, 'Term::ANSIColor';

print color('bold red');
print "hii";
print color('reset');
Related Posts Related Posts :
  • How to parse the data from JSON iOS
  • Using jq to combine json files, getting file list length too long error
  • How to Decode & Map JSON Objects using NewDecode, Golang and req *http.Request
  • When receive Array / Dictionary from Firebase
  • JSONProvider namespaceMap config in web.xml for Apache CXF
  • Having trouble PUTting profile variables in Watson Dialog service
  • Removing parts of a JSON response from API
  • Posting a JSON true value with Mojolicious
  • Typescript internal module not recognized by VS Code
  • How to use com.google.appengine.labs.repackaged.org.json in Android Studio
  • jsr 303 validated all fields in object
  • Nested ng-repeat with json strange result
  • Swift 2 - Real-time JSON feed
  • Apache Solr suggester dictionary is not updated after removing some records from collection
  • Sending sms from twitter to mobile number
  • How to display all data from a map in json format - Golang?
  • Nested objects in Json
  • Are there any variables available inside the package.json environment?
  • How to create json file in node js
  • How to do a very large query on sails-mongo?
  • Set key value in ngOptions AngularJS
  • Getting Values of a JSON Object using webmeothd in vb.net
  • AngularJS module.factory get remote json
  • Alamofire type of expression is ambiguous without more context
  • Parse error on line 1: { #networkports "l ----------^ Expecting 'STRING', '}'
  • Best way to Read WordPress as JSON
  • Getting Values of a JSON Object in vb.net
  • errors in importing json file in mongo db
  • Parsing "the rest" of an aeson object
  • mongoimport removes first record
  • GoogleCode Store Locator
  • Unexpected character encountered while parsing value:
  • Sequelize underscore / snake case when converted to json
  • Grabbing the current viewer count for youtube live streaming
  • Format and store JSON date in AngularJS variable
  • Object required: '[undefined]' error when looping through JSON data
  • Creating a url object in swift
  • In perl, print the last item value from JSON data
  • Create HighCharts-Column type from JSON
  • typescript parse json with class and interface
  • How should I filter multiple fields with the same name in logstash?
  • Controlling Plotly icons
  • Json within a Json
  • AngularJS Multiple Select in Query
  • UI5 XML View vs JSON View Grouped List
  • Incorect value for Float when using Json.toJson
  • My composer.json does not install new dependencies using composer update command
  • Entry delimiter of JSON files for Hive table
  • MongoDB / Node: Insert part of a doc in a collection into a doc in another collection
  • No pagination information using instagram API
  • Guzzle - Get Raw JSON Response
  • Implicit json Writes and Reads for Java8 ZonedDateTime in Play 2.3.x?
  • How to get value of json data using SwiftyJSON
  • Not able to process json string data in golang struct
  • JQ JSON parser, concatenate a certain child of an array
  • What is the easiest way to render a freemarker object as JSON?
  • Error in getting JSON response from WSO2 DSS server where it contains a bit/boolean: "Error while writing to the ou
  • Classic ASP JSON sub collection
  • SoapUI JSON Path assertion for two different strings not using JsonSlurper
  • Perl JSON encode in UTF-8 strange behaviour
  • shadow
    Privacy Policy - Terms - Contact Us © animezone.co