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Allegro CL
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  6 Iteration   6.1 The LOOP Facility   6.1.2 Variable Initialization and Stepping Clauses   6.1.2.1 Iteration Control

6.1.2.1.7 The for-as-package subclause

In the for-as-package subclause the for or as construct iterates over the symbols in a package. In this syntax, a compound preposition is used to designate access to a package. The variable var takes on the value of each symbol in the supplied package. The following loop keywords serve as valid prepositions within this syntax:

  • being

    The keyword being introduces either the Loop schema symbol, present-symbol, or external-symbol.

  • each, the

    The loop keyword each follows the loop keyword being when symbol, present-symbol, or external-symbol is used. The loop keyword the is used with symbols, present-symbols, and external-symbols only for ease of reading. This agreement isn't required.

  • present-symbol, present-symbols

    These Loop schemas iterate over the symbols that are present in a package. The package to be iterated over is supplied in the same way that package arguments to find-package are supplied. If the package for the iteration is not supplied, the current package is used. If a package that does not exist is supplied, an error of type package-error is signaled.

  • symbol, symbols

    These Loop schemas iterate over symbols that are accessible in a given package. The package to be iterated over is supplied in the same way that package arguments to find-package are supplied. If the package for the iteration is not supplied, the current package is used. If a package that does not exist is supplied, an error of type package-error is signaled.

  • external-symbol, external-symbols

    These Loop schemas iterate over the external symbols of a package. The package to be iterated over is supplied in the same way that package arguments to find-package are supplied. If the package for the iteration is not supplied, the current package is used. If a package that does not exist is supplied, an error of type package-error is signaled.

  • in, of

    These loop prepositions introduce package.

In effect

being {each | the} {symbol | symbols | present-symbol | present-symbols | external-symbol | external-symbols} {in | of}

is a compound preposition.

Iteration stops when there are no more symbols to be referenced in the supplied package.

6.1.2.1.7.1  Examples of for-as-package subclause


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