Mercurial > pub > Impl

annotate Lib/IMPL/declare.pm @ 265:6b6d4b2275a1

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improved documentation
author cin
date Thu, 10 Jan 2013 03:25:02 +0400
parents 32aceba4ee6d
children 6253872024a4
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1 package IMPL::declare;
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2 use strict;
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3
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4 use Scalar::Util qw(set_prototype);
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5 use Carp qw(carp);
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6 use IMPL::Class::PropertyInfo();
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7 use IMPL::Const qw(:access);
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8 use IMPL::require();
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9
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10 BEGIN {
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11 *_require = *IMPL::require::_require;
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12 *_trace = *IMPL::require::_trace;
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13 }
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14
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15 sub import {
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16 my ( $self, $args ) = @_;
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17
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18 return unless $args;
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19
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20 die "A hash reference is required" unless ref $args eq 'HASH';
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21
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22 no strict 'refs';
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23
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24 my $caller = caller;
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25
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26 my $aliases = $args->{require} || {};
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27
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28 $IMPL::require::PENDING{$caller} = 1;
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29 _trace("declare $caller");
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30 $IMPL::require::level++;
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31
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32 while ( my ( $alias, $class ) = each %$aliases ) {
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33 _trace("$alias => $class");
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34 $IMPL::require::level ++;
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35 my $c = _require($class);
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36
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37 *{"${caller}::$alias"} = set_prototype(
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38 sub {
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39 $c;
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40 },
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41 ''
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42 );
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43 $IMPL::require::level --;
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44 }
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45
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46 my $base = $args->{base} || {};
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47
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48 my %ctor;
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49 my @isa;
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50
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51 if ( ref $base eq 'ARRAY' ) {
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52 carp "Odd elements number in require"
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53 unless scalar(@$base) % 2 == 0;
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54 while ( my ( $class, $mapper ) = splice @$base, 0, 2 ) {
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55 _trace("parent $class");
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56 $IMPL::require::level ++;
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57 $class = $aliases->{$class} || _require($class);
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58 $IMPL::require::level --;
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59
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60 push @isa, $class;
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61 $ctor{$class} = $mapper;
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62 }
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63 }
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64 elsif ( ref $base eq 'HASH' ) {
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65 while ( my ( $class, $mapper ) = each %$base ) {
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66 _trace("parent $class");
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67 $IMPL::require::level ++;
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68 $class = $aliases->{$class} || _require($class);
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69 $IMPL::require::level --;
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70
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71 push @isa, $class;
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72 $ctor{$class} = $mapper;
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73 }
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74 }
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75
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76 *{"${caller}::CTOR"} = \%ctor;
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77 *{"${caller}::ISA"} = \@isa;
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79 my $props = $args->{props} || [];
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80
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81 if ( $props eq 'HASH' ) {
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82 $props = [%$props];
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83 }
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84
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85 die "A hash or an array reference is required in the properties list"
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86 unless ref $props eq 'ARRAY';
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87
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88 carp "Odd elements number in properties declaration of $caller"
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89 unless scalar(@$props) % 2 == 0;
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90
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91 if (@$props) {
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92 $self->_implementProps($props,$caller);
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93 }
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94
256
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95 if ($args->{_implement}) {
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96 $self->_implementProps($caller->abstractProps,$caller);
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97 }
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98
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99 $IMPL::require::level--;
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100 delete $IMPL::require::PENDING{$caller};
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101 }
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102
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103 sub _implementProps {
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104 my ($self, $props, $caller) = @_;
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105
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106 for ( my $i = 0 ; $i < @$props - 1 ; $i = $i + 2 ) {
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107 my ( $prop, $spec ) = @{$props}[ $i, $i + 1 ];
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108
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109 my $propInfo = IMPL::Class::PropertyInfo->new(
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110 {
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111 Name => $prop,
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112 Mutators => $spec,
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113 Class => $caller,
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114 Access => $prop =~ /^_/
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115 ? ACCESS_PRIVATE
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116 : ACCESS_PUBLIC
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117 }
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118 );
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119 $propInfo->Implement();
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120 }
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121 }
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122
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123 1;
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124
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125 __END__
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126
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127 =pod
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128
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129 =head1 NAME
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130
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131 C<IMPL::declare> - описывает класс
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132
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133 =head1 SYNOPSIS
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134
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135 =begin code
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136
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137 package My::Bar;
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138
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139 use IMPL::declare {
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140 require => {
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141 TFoo => 'My::Foo',
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142 TBox => 'My::Box'
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143 },
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144 base => {
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145 TFoo => '@_',
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146 'IMPL::Object' => undef,
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147 }
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148 }
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149
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150 sub CreateBox {
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151 my ($this) = @_;
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152 return TBox->new($this);
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153 }
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154
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155 =end code
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156
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157 Специальная ситрока C<@_> означает передачу параметров конструктора текущего класса конструктору
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158 базового класса без изменений.
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159
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160 =head1 DESCRIPTION
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161
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162 Описывает текущий пакет(модуль) как класс. В качестве параметра получает ссылку на хеш,
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163 в которой храняться метаданные для объявления класса.
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164
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165 =head1 METADATA
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166
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167 =head2 C<require>
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168
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169 Содержит ссылку на хеш с синонимами модулей, которые будут доступны в текушем модуле,
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170 аналогично использованию C<IMPL::require>. Однако, если модуль не требует загрузки при
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171 помощи C<require> нужно использовать префикс C<'-'> в его имени
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172
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173 =begin code
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174
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175 {
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176 require => {
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177 TObject => 'IMPL::Object', # will be loaded with require
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178 TFoo => '-My:App::Data::Foo' # will not use 'require' to load module
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179 }
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180 }
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181
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182 =end code
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183
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184 =head2 C<base>
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185
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186 Обисывает базове классы для текущего класса. Если данный параметр - ссылка массив, то
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187 этот массив будет превращен в массив C<@ISA>. Если данный параметр - ссылка на хеш, то
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188 его ключи опичавют список базовых классов, а значения - преобразование параметров для
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189 вызова базовых конструкторов.
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190
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191 В качестве имен базовых классов могут быть как полные имена модулей, так и назначенные
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192 ранее псевдонимы. Использование префикса C<'-'> перед B<полным именем модуля> означает,
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193 что модуль не требуется загружать, в случае с псевдонимами, префикс C<'-'> уже был указан
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194 при их объявлении.
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195
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196 =begin code
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197
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198 {
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199 require => {
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200 TFoo => '-My:App::Data::Foo' # will not use 'require' to load module
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201 },
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202 base => {
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203 TFoo => '@_', # pass parameters unchanged
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204 'My::Base::Class' => sub { name => $_[0], data => $_[1] }, # remap parameters
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205 '-My::Extentions' => undef, # do not pass any parameters
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206 }
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207 }
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208
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209 =end code
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210
228
431db7034a88 Для синхронизации
andrei <andrei@nap21.upri>
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211 =cut