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Article contents:[[tags: egg]] [[toc:]] == latch === Introduction Allows evaluating expressions just once. === Usage <enscript highlight=scheme> (import latch) </enscript> === Requirements [[matchable]] === Documentation <macro>(let-once ((IDENTIFIER EXPR) ...) BODY ...)</macro> Binds {{IDENTIFIER}} to the result of evaluating {{EXPR}} and evaluates {{BODY}}. On any subsequent evaluation of the {{let-once}} form, the result of {{EXPR}} is re-used and evaluation of {{EXPR}} is skipped. <macro>(let*-once ((IDENTIFIER EXPR) ...) BODY ...)</macro> Like {{let-once}}, but binds sequentially (just like {{let*}}). === Author [[/users/felix winkelmann|felix winkelmann]] === Repository This egg is hosted on the CHICKEN Subversion repository: [[https://anonymous@code.call-cc.org/svn/chicken-eggs/release/5/latch|https://anonymous@code.call-cc.org/svn/chicken-eggs/release/5/latch]] If you want to check out the source code repository of this egg and you are not familiar with Subversion, see [[/egg-svn-checkout|this page]]. === License This code is placed into the public domain. === Version History ; 0.3 : port to CHICKEN 5 ; 0.1 : initial release Description of your changes:

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