From: Robert Klemme <shortcutter@...>
Date: 2008-06-27T23:45:17+09:00
Subject: Re: define_method with block

2008/6/27 Robert Dober <robert.dober@gmail.com>:
> On Fri, Jun 27, 2008 at 1:21 PM, Leslie Viljoen <leslieviljoen@gmail.com> wrote:
>> Hi!
>>
>> Is there a way that methods defined with define_method can take a block?
> Short answers
> 1.8 : No
> 1.9 : Yes

1.9 is still a bit inconsistent here IMHO:

irb(main):001:0> RUBY_VERSION
=> "1.9.0"
irb(main):002:0> class Foo
irb(main):003:1> define_method(:bar) do
irb(main):004:2* yield 123
irb(main):005:2> end
irb(main):006:1> end
=> #<Proc:0x7feeea10@(irb):4 (lambda)>
irb(main):007:0> Foo.new.bar {|x| p x}
LocalJumpError: no block given (yield)
        from (irb):4:in `block (1 levels) in <class:Foo>'
        from (irb):7
        from /opt/lib/ruby/1.9.0/irb.rb:149:in `block (2 levels) in eval_input'
        from /opt/lib/ruby/1.9.0/irb.rb:262:in `signal_status'
        from /opt/lib/ruby/1.9.0/irb.rb:146:in `block in eval_input'
        from /opt/lib/ruby/1.9.0/irb.rb:145:in `eval_input'
        from /opt/lib/ruby/1.9.0/irb.rb:69:in `block in start'
        from /opt/lib/ruby/1.9.0/irb.rb:68:in `catch'
        from /opt/lib/ruby/1.9.0/irb.rb:68:in `start'
        from /opt/bin/irb19:12:in `<main>'
irb(main):008:0> class Foo
irb(main):009:1> define_method(:bar) do |&b|
irb(main):010:2* b[123]
irb(main):011:2> end
irb(main):012:1> end
=> #<Proc:0x7fee49c0@(irb):10 (lambda)>
irb(main):013:0> Foo.new.bar {|x| p x}
123
=> 123
irb(main):014:0>

Kind regards

robert

-- 
use.inject do |as, often| as.you_can - without end