1 minute, 4 seconds
The Order of Evaluation
- slide 7 : 26
A motivating example - clarification
What is the value of the following expression?
((lambda (x) 1)
some-infinite-calculation
)
A variation of the example in Scheme.
Different evaluation orders give different 'results'
The number 1
A non-terminating calculation
Two different semantics of function application are involved:
Strict
: A function call is well-defined if and only if all actual parameters are well-defined
Non-strict
: A function call can be well-defined even if one or more actual parameters cause an error or an infinite calculation
