Obtain a caller’s binding in MRI Ruby 1.9.3+.
def f x = 33 g end def g BindingOfCaller.binding_of_caller do |bind| eval("x", bind) end end p f # => 33
Obtain a caller’s binding in MRI Ruby 1.9.3 or higher through the use of a continuation.
(1) Statements cannot appear after the binding_of_caller
block.
def f x = 33 g end def g BindingOfCaller.binding_of_caller do |bind| eval("x", bind) end puts "hello" # <-- error end
(2) The method using binding_of_caller
cannot appear inside a method call.
def f x = 33 run(g) # <-- error end def h x = 33 result = g run(result) # OK end def g BindingOfCaller.binding_of_caller do |bind| eval("x", bind) end end
(3) The method using binding_of_caller
cannot be called from the last line of a block or global scope.
def f 1.times do x = 33 g # <-- error: last line of block end end def h 1.times do x = 33 g # <-- OK nil end end def g BindingOfCaller.binding_of_caller do |bind| eval("x", bind) end end
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James M. Lawrence < quixoticsycophant@gmail.com >
Copyright (c) 2011 James M. Lawrence. All rights reserved. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.