|  line  | 
 stmt  | 
 bran  | 
 cond  | 
 sub  | 
 pod  | 
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 #!/usr/bin/perl -c  | 
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3
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 package constant::boolean;  | 
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4
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5
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 =head1 NAME  | 
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6
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7
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 constant::boolean - Define TRUE and FALSE constants.  | 
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8
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9
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 =head1 SYNOPSIS  | 
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10
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11
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   use constant::boolean;  | 
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12
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13
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   use File::Spec;  | 
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14
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15
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   sub is_package_exist {  | 
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16
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     my ($package) = @_;  | 
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17
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     return FALSE unless defined $package;  | 
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18
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     foreach my $inc (@INC) {  | 
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19
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         my $filename = File::Spec->catfile(  | 
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20
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             split( /\//, $inc ), split( /\::/, $package )  | 
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21
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         ) . '.pm';  | 
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22
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         return TRUE if -f $filename;  | 
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23
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     };  | 
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24
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     return FALSE;  | 
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26
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   no constant::boolean;  | 
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28
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29
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 =head1 DESCRIPTION  | 
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30
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31
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 Defines C and C constants in caller's namespace.  You could use  | 
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32
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 simple values like empty string or zero for false, or any non-empty and  | 
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33
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 non-zero string value as true, but the C and C constants are more  | 
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34
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 descriptive.  | 
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35
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36
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 It is virtually the same as:  | 
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38
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   # double "not" operator is used for converting scalar to boolean value  | 
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39
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   use constant TRUE => !! 1;  | 
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40
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   use constant FALSE => !! '';  | 
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41
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42
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 The constants exported by C are not reported by  | 
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43
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 L, so it is more convenient to use this module than to  | 
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44
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 define C and C constants by yourself.  | 
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45
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46
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 The constants can be removed from class API with C  | 
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47
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 pragma or some universal tool like L.  | 
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48
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49
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 =for readme stop  | 
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50
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 =cut  | 
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52
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53
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2
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2
  
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1591
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 use 5.006;  | 
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2
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7
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2
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93
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54
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55
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2
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2
  
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11
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 use strict;  | 
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2
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3
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2
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73
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56
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2
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2
  
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24
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 use warnings;  | 
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2
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4
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2
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154
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57
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58
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 our $VERSION = '0.02';  | 
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59
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60
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61
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 sub import {  | 
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62
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2
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2
  
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17
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     my $caller = caller;  | 
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63
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64
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2
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2
  
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10
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     no strict 'refs';  | 
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2
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2
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2
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384
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65
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     # double "not" operator is used for converting scalar to boolean value  | 
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66
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2
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4
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     *{"${caller}::TRUE"}  = sub () { !! 1 };  | 
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2
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14
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67
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2
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478
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     *{"${caller}::FALSE"} = sub () { !! '' };  | 
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2
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12
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| 
68
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| 
69
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2
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43
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     return 1;  | 
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70
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| 
71
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    | 
| 
72
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73
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 sub unimport {  | 
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74
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1
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1
  
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3358
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     require Symbol::Util;  | 
| 
75
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    | 
| 
76
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1
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2485
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     my $caller = caller;  | 
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77
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1
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7
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     Symbol::Util::delete_sub("${caller}::$_") foreach qw( TRUE FALSE );  | 
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78
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    | 
| 
79
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1
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173
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     return 1;  | 
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80
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81
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82
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83
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 1;  | 
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84
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    | 
| 
85
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    | 
| 
86
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 =head1 BUGS  | 
| 
87
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    | 
| 
88
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 If you find the bug or want to implement new features, please report it at  | 
| 
89
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 | 
 L  | 
| 
90
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    | 
| 
91
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 =for readme continue  | 
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92
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    | 
| 
93
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 =head1 AUTHOR  | 
| 
94
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    | 
| 
95
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 | 
 Piotr Roszatycki   | 
| 
96
 | 
 
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 | 
 
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 | 
 
 | 
 
 | 
    | 
| 
97
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 | 
 
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 | 
 
 | 
 
 | 
 =head1 LICENSE  | 
| 
98
 | 
 
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    | 
| 
99
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 Copyright 2008, 2009 by Piotr Roszatycki .  | 
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100
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101
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 This program is free software; you can redistribute it and/or modify it  | 
| 
102
 | 
 
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 under the same terms as Perl itself.  | 
| 
103
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    | 
| 
104
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 See L  |