Continuations by Example
Continuations are powerful in control-flow constructs, enabling exceptions, search, threads, generators, and coroutines. They capture remaining computation steps, aiding in non-deterministic choices and efficient iteration over data structures.
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Continuations are a powerful but often misunderstood concept in control-flow constructs. They enable the implementation of features like exceptions, backtracking search, threads, generators, and coroutines. By using first-class continuations, programmers can introduce non-deterministic choice procedures like 'amb' in Scheme. This allows for solving problems like the Pythagorean theorem with ease. Continuations represent the remaining steps in a computation, and languages like Scheme provide mechanisms like call/cc to capture and manipulate continuations. Additionally, continuations can be used to implement generators for efficient iteration over complex data structures without the need for intermediate data storage. Furthermore, continuations facilitate cooperative multithreading, where threads must yield control manually. By understanding continuations and their applications, programmers can leverage their power to create more efficient and flexible code structures.
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3 comments (continuation of 3 \* (f() + 8))(result) ;
The value passed to the continuation is the return value of the call.
During the execution of the expression body, the variable current-continuation is bound to the current continuation. If invoked, current-continuation immediately returns from the call to call/cc ...
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