lookahead

Lookahead may refer to:

• Lookahead in combinatorial search, a parameter of some combinatorial search algorithms, roughly, how deeply the graph representing the problem is explored
• Lookahead in parsing, a parameter of some parsing algorithms, the maximum incoming tokens that a parser can use to decide which rule it should use
• Lookahead in dynamic range compression, signal processing design to overcome the problem of being forced to compromise between slow attack rates that produce smooth-sounding gain changes, and fast attack rates capable of catching transients
• Lookahead in backtracking, the generic term for a subprocedure that attempts to foresee the effects of choosing a branching variable to evaluate or one of its values
• Lookahead carry unit, a logical unit in digital circuit design used to decrease calculation time in adder units

Mit Lookahead bezeichnet man die Vorausschau auf Eingaben beim automatischen Verarbeiten von Texten im Compilerbau.

Podgląd w rozmaitych algorytmach polega na wczytywaniu danych wejściowych "na zapas" przed podejmowaniem kosztownej obliczeniowo decycji.