1Module::Load(3)       User Contributed Perl Documentation      Module::Load(3)
2
3
4

NAME

6       Module::Load - runtime require of both modules and files
7

SYNOPSIS

9         use Module::Load;
10
11         my $module = 'Data::Dumper';
12
13         load Data::Dumper;     # loads that module, but not import any functions
14                                # -> cannot use 'Dumper' function
15
16         load 'Data::Dumper';   # ditto
17         load $module           # tritto
18
19         autoload Data::Dumper; # loads that module and imports the default functions
20                                # -> can use 'Dumper' function
21
22         my $script = 'some/script.pl'
23         load $script;
24         load 'some/script.pl';  # use quotes because of punctuations
25
26         load thing;             # try 'thing' first, then 'thing.pm'
27
28         load CGI, ':all';       # like 'use CGI qw[:standard]'
29

DESCRIPTION

31       "Module::Load" eliminates the need to know whether you are trying to
32       require either a file or a module.
33
34       If you consult "perldoc -f require" you will see that "require" will
35       behave differently when given a bareword or a string.
36
37       In the case of a string, "require" assumes you are wanting to load a
38       file. But in the case of a bareword, it assumes you mean a module.
39
40       This gives nasty overhead when you are trying to dynamically require
41       modules at runtime, since you will need to change the module notation
42       ("Acme::Comment") to a file notation fitting the particular platform
43       you are on.
44
45       "Module::Load" eliminates the need for this overhead and will just
46       DWYM.
47
48   Difference between "load" and "autoload"
49       "Module::Load" imports the two functions - "load" and "autoload"
50
51       "autoload" imports the default functions automatically, but "load" do
52       not import any functions.
53
54       "autoload" is usable under "BEGIN{};".
55
56       Both the functions can import the functions that are specified.
57
58       Following codes are same.
59
60         load File::Spec::Functions, qw/splitpath/;
61
62         autoload File::Spec::Functions, qw/splitpath/;
63

FUNCTIONS

65       load
66           Loads a specified module.
67
68           See "Rules" for detailed loading rule.
69
70       autoload
71           Loads a specified module and imports the default functions.
72
73           Except importing the functions, 'autoload' is same as 'load'.
74
75       load_remote
76           Loads a specified module to the specified package.
77
78             use Module::Load 'load_remote';
79
80             my $pkg = 'Other::Package';
81
82             load_remote $pkg, 'Data::Dumper'; # load a module to 'Other::Package'
83                                               # but do not import 'Dumper' function
84
85           A module for loading must be quoted.
86
87           Except specifing the package and quoting module name, 'load_remote'
88           is same as 'load'.
89
90       autoload_remote
91           Loads a specified module and imports the default functions to the
92           specified package.
93
94             use Module::Load 'autoload_remote';
95
96             my $pkg = 'Other::Package';
97
98             autoload_remote $pkg, 'Data::Dumper'; # load a module to 'Other::Package'
99                                                   # and imports 'Dumper' function
100
101           A module for loading must be quoted.
102
103           Except specifing the package and quoting module name,
104           'autoload_remote' is same as 'load_remote'.
105

Rules

107       All functions have the following rules to decide what it thinks you
108       want:
109
110       ·   If the argument has any characters in it other than those matching
111           "\w", ":" or "'", it must be a file
112
113       ·   If the argument matches only "[\w:']", it must be a module
114
115       ·   If the argument matches only "\w", it could either be a module or a
116           file. We will try to find "file.pm" first in @INC and if that
117           fails, we will try to find "file" in @INC.  If both fail, we die
118           with the respective error messages.
119

IMPORTS THE FUNCTIONS

121       'load' and 'autoload' are imported by default, but 'load_remote' and
122       'autoload_remote' are not imported.
123
124       To use 'load_remote' or 'autoload_remote', specify at 'use'.
125
126       "load","autoload","load_remote","autoload_remote"
127           Imports the selected functions.
128
129             # imports 'load' and 'autoload' (default)
130             use Module::Load;
131
132             # imports 'autoload' only
133             use Module::Load 'autoload';
134
135             # imports 'autoload' and 'autoload_remote', but don't import 'load';
136             use Module::Load qw/autoload autoload_remote/;
137
138       'all'
139           Imports all the functions.
140
141             use Module::Load 'all'; # imports load, autoload, load_remote, autoload_remote
142
143       '','none',undef
144           Not import any functions ("load" and "autoload" are not imported).
145
146             use Module::Load '';
147
148             use Module::Load 'none';
149
150             use Module::Load undef;
151

Caveats

153       Because of a bug in perl (#19213), at least in version 5.6.1, we have
154       to hardcode the path separator for a require on Win32 to be "/", like
155       on Unix rather than the Win32 "\". Otherwise perl will not read its own
156       %INC accurately double load files if they are required again, or in the
157       worst case, core dump.
158
159       "Module::Load" cannot do implicit imports, only explicit imports.  (in
160       other words, you always have to specify explicitly what you wish to
161       import from a module, even if the functions are in that modules'
162       @EXPORT)
163

SEE ALSO

165       Module::Runtime provides functions for loading modules, checking the
166       validity of a module name, converting a module name to partial ".pm"
167       path, and related utility functions.
168
169       "require" in perlfunc <https://metacpan.org/pod/perlfunc#require> and
170       "use" in perlfunc <https://metacpan.org/pod/perlfunc#use>.
171
172       Mojo::Loader is a "class loader and plugin framework", and is included
173       in the Mojolicious <https://metacpan.org/release/Mojolicious>
174       distribution.
175
176       Module::Loader is a module for finding and loading modules in a given
177       namespace, inspired by "Mojo::Loader".
178

ACKNOWLEDGEMENTS

180       Thanks to Jonas B. Nielsen for making explicit imports work.
181

BUG REPORTS

183       Please report bugs or other issues to <bug-module-load@rt.cpan.org<gt>.
184

AUTHOR

186       This module by Jos Boumans <kane@cpan.org>.
187
189       This library is free software; you may redistribute and/or modify it
190       under the same terms as Perl itself.
191
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193
194perl v5.30.0                      2019-07-26                   Module::Load(3)
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