> On 31 Oct 2016, at 14:17, CodeDmitry <dimamakh...@gmail.com> wrote: > > I am looking at > > ifTrue: alternativeBlock > "If the receiver is false (i.e., the condition is false), then the > value is > the > false alternative, which is nil. Otherwise answer the result of > evaluating > the argument, alternativeBlock. Create an error notification if the > receiver is nonBoolean. Execution does not actually reach here because > the expression is compiled in-line." > > self subclassResponsibility > > In order to perform the block, ifTrue must somehow end up evaluating the > block, but this code only sends a subclassResponsibility message to itself > and implicitly returns itself. > > Where does the block actually get evaluated?
In the sub classes of Boolean, True and False. Have a look at ALL implementors of #ifTrue: or #ifFalse: There is only one instance of True, the constant true, same for False and false. HTH, Sven > > > > -- > View this message in context: > http://forum.world.st/How-does-Boolean-ifTrue-work-tp4920873.html > Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com. >
