Delimited continuation

In programming languages, a delimited continuation, composable continuation or partial continuation, is a "slice" of a continuation frame that has been reified into a function. Unlike regular continuations, delimited continuations return a value, and thus may be reused and composed. Control delimiters, the basis of delimited continuations, were introduced by Matthias Felleisen in 1988 though early allusions to composable and delimited continuations can be found in Carolyn Talcott's Stanford 1984 dissertation, Felleisen and Friedman's PARL 1987 paper, and Felleisen's 1987 dissertation.

Delimited continuations were first introduced by Felleisen in 1988 with an operator called ${\displaystyle {\mathcal {F}}}$, first introduced in a tech report in 87, along with a prompt construct ${\displaystyle \#}$. The operator was designed to be a generalization of control operators that had been described in the literature such as call/cc from Scheme, ISWIM's J operator, John C. Reynolds' escape operator, and others. Subsequently, many competing delimited control operators were invented by the programming languages research community such as prompt & control,shift & reset,cupto,fcontrol, and others.

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