Languages with dynamic scope resolution sacrifice this safety for more flexibility; they can typically set and get variables in the same scope at runtime.
12.
Heady and hypnotic, driving and relentless, tumultuous and visceral, sonic and serene, the sheer odyssey that is Black Oni encompasses many paradoxes in its massively dynamic scope.
13.
In his sonata cycle, Schiff combined a measure of scholarly correctness ( observing all the repeats, for example ) with a Romantic approach to timbral variety and dynamic scope.
14.
A variable may be declared local, then its scope is limited to that procedure and any procedures that it calls ( a . k . a . dynamic scope ).
15.
In some languages, however, " part of a program " refers to " portion of run time ( time period during execution ) ", and is known as "'dynamic scope " '.
16.
And that variable must be made thread-local ( or else a big mutex must be used ) so the scheme doesn't break under threads : dynamic scope implementations can take care of this also.
17.
Bindings which exhibit dynamic extent ( lifetime tied to the activation and deactivation of a block ) and indefinite scope ( visible to all functions which are called from that block ) are said to have dynamic scope.
18.
Function bindings cannot be dynamically scoped using flet ( which only provides lexically scoped function bindings ), but function objects ( a first-level object in Common Lisp ) can be assigned to dynamically scoped variables, bound using let in dynamic scope, then called using funcall or APPLY.
19.
By contrast, were a similar fragment to be written in a language with dynamic scope, the n in the calling function would remain in context in the called function the scopes would overlap and would be masked ( " shadowed " ) by the new n in the called function.
20.
Special variables allow for a module A to set up a binding for a variable X which is visible to another module B, called from A . Being able to do this is an advantage, and being able to prevent it from happening is also an advantage; consequently, Common Lisp supports both lexical and dynamic scope.
