1Rose::DB::Object::MakeMUestehrodCso:n:tBriigbNuutme(d3R)Poesrel::DDoBc:u:mOebnjteactti:o:nMakeMethods::BigNum(3)
2
6 Rose::DB::Object::MakeMethods::BigNum - Create object methods for
7 arbitrary-precision numeric attributes for Rose::DB::Object-derived
8 objects.
9
11 package MyDBObject;
12 our @ISA = qw(Rose::DB::Object);
14 use Rose::DB::Object::MakeMethods::BigNum
16 (
17 bigint =>
18 [
19 count =>
20 {
21 with_init => 1,
22 min => 0,
23 },
24 # Important: specify very large integer values as strings
26 tally => { default => '9223372036854775800' },
27 ],
28 );
29 sub init_count { 12345 }
31 ...
32 $obj = MyDBObject->new(...);
34 print $obj->count; # 12345
36 print $obj->tally; # 9223372036854775800
37
39 Rose::DB::Object::MakeMethods::BigNum is a method maker that inherits
40 from Rose::Object::MakeMethods. See the Rose::Object::MakeMethods
41 documentation to learn about the interface. The method types provided
42 by this module are described below.
43 All method types defined by this module are designed to work with
45 objects that are subclasses of (or otherwise conform to the interface
46 of) Rose::DB::Object. See the Rose::DB::Object documentation for more
47 details.
48
50 bigint
51 Create get/set methods for big integer attributes. Values are
52 stored internally and returned as Math::BigInt objects. When
53 specifying very large integer values, use strings to be safe. (See
54 an example in the synopsis above.)
55 Options
57 check_in ARRAYREF
58 A reference to an array of valid values. When setting the
59 attribute, if the new value is not equal to one of the
60 valid values, a fatal error will occur.
61 default VALUE
63 Determines the default value of the attribute.
64 hash_key NAME
66 The key inside the hash-based object to use for the storage
67 of this attribute. Defaults to the name of the method.
68 init_method NAME
70 The name of the method to call when initializing the value
71 of an undefined attribute. Defaults to the method name
72 with the prefix "init_" added. This option implies
73 "with_init".
74 interface NAME
76 Choose the interface. The default is "get_set".
77 max INT
79 Get or set the maximum value this attribute is allowed to
80 have.
81 min INT
83 Get or set the minimum value this attribute is allowed to
84 have.
85 with_init BOOL
87 Modifies the behavior of the "get_set" and "get"
88 interfaces. If the attribute is undefined, the method
89 specified by the "init_method" option is called and the
90 attribute is set to the return value of that method.
91 Interfaces
93 Interfaces
94 get_set
95 Creates a get/set method for a big integer object
96 attribute. When called with an argument, the value of
97 the attribute is set. The current value of the
98 attribute is returned.
99 get Creates an accessor method for a big integer object
101 attribute that returns the current value of the
102 attribute.
103 set Creates a mutator method for a big integer object
105 attribute. When called with an argument, the value of
106 the attribute is set. If called with no arguments, a
107 fatal error will occur.
108 Example:
110 package MyDBObject;
112 our @ISA = qw(Rose::DB::Object);
114 use Rose::DB::Object::MakeMethods::BigNum
116 (
117 bigint =>
118 [
119 count =>
120 {
121 with_init => 1,
122 min => 0,
123 },
124 # Important: specify very large integer values as strings
126 tally => { default => '9223372036854775800' },
127 ],
128 );
129 sub init_count { 12345 }
131 ...
132 $obj = MyDBObject->new(...);
134 print $obj->count; # 12345
136 print $obj->tally; # 9223372036854775800
137 $obj->count(-1); # Fatal error: minimum value is 0
139
141 John C. Siracusa (siracusa@gmail.com)
142
144 Copyright (c) 2010 by John C. Siracusa. All rights reserved. This
145 program is free software; you can redistribute it and/or modify it
146 under the same terms as Perl itself.
147perl v5.30.0 2019-R0o7s-e2:6:DB::Object::MakeMethods::BigNum(3)