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Jensen's device is a computer programming technique that exploits call by name. It was devised by Danish computer scientist Jørn Jensen, who worked with Peter Naur at Regnecentralen. They worked on the GIER ALGOL compiler, one of the earliest correct implementations of ALGOL 60. ALGOL 60 used call by name. During his Turing Award speech, Naur mentions his work with Jensen on GIER ALGOL.

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  • Jensen's device (en)
  • Jensen device (nl)
  • Трюк Йенсена (ru)
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  • Jensen's device is a computer programming technique that exploits call by name. It was devised by Danish computer scientist Jørn Jensen, who worked with Peter Naur at Regnecentralen. They worked on the GIER ALGOL compiler, one of the earliest correct implementations of ALGOL 60. ALGOL 60 used call by name. During his Turing Award speech, Naur mentions his work with Jensen on GIER ALGOL. (en)
  • Het Jensen device is een in sommige compilers toepasbare constructie waarin het mogelijk is om parameters die van elkaar afhankelijk zijn met call-by-name door te geven. De evaluatie van de parameterexpressie wordt pas in de procedureaanroep uitgevoerd tijdens executie van het programma. Een taal waarin het Jensen device toepasbaar is, is Algol 60. Het Jensen device is bedacht in 1960 door de Deen . integer procedure optellen(i, n, x); value n; integer n;begin integer som; som := 0; for i:=1 step 1 until n do som := som+x; optellen := som;end (nl)
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  • Jensen's device is a computer programming technique that exploits call by name. It was devised by Danish computer scientist Jørn Jensen, who worked with Peter Naur at Regnecentralen. They worked on the GIER ALGOL compiler, one of the earliest correct implementations of ALGOL 60. ALGOL 60 used call by name. During his Turing Award speech, Naur mentions his work with Jensen on GIER ALGOL. (en)
  • Het Jensen device is een in sommige compilers toepasbare constructie waarin het mogelijk is om parameters die van elkaar afhankelijk zijn met call-by-name door te geven. De evaluatie van de parameterexpressie wordt pas in de procedureaanroep uitgevoerd tijdens executie van het programma. Een taal waarin het Jensen device toepasbaar is, is Algol 60. Het Jensen device is bedacht in 1960 door de Deen . integer procedure optellen(i, n, x); value n; integer n;begin integer som; som := 0; for i:=1 step 1 until n do som := som+x; optellen := som;end Hierin is x een expressie die afhankelijk is van i. Wordt in de functie de waarde van i veranderd, dan verandert ook de waarde van x. De aanroep optellen(i, n, u[i]*v[i]) kan zo het inwendig product van de vectoren u en v berekenen.Het gebruik van optellen(i, n, sin(i) ) telt waarden van de sinusfunctie op. (nl)
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