From 9279174dde3e1a450e63e866d2683352dd8238d3 Mon Sep 17 00:00:00 2001 From: Eelco Dolstra Date: Thu, 14 Aug 2008 14:00:44 +0000 Subject: * Added an experimental feature suggested by Andres: ellipses ("...") in attribute set pattern matches. This allows defining a function that takes *at least* the listed attributes, while ignoring additional attributes. For instance, {stdenv, fetchurl, fuse, ...}: stdenv.mkDerivation { ... }; defines a function that requires an attribute set that contains the specified attributes but ignores others. The main advantage is that we can then write in all-packages.nix aefs = import ../bla/aefs pkgs; instead of aefs = import ../bla/aefs { inherit stdenv fetchurl fuse; }; This saves a lot of typing (not to mention not having to update all-packages.nix with purely mechanical changes). It saves as much typing as the "args: with args;" style, but has the advantage that the function arguments are properly declared (not implicit in what the body of the "with" uses). --- src/libexpr/nixexpr.hh | 1 + 1 file changed, 1 insertion(+) (limited to 'src/libexpr/nixexpr.hh') diff --git a/src/libexpr/nixexpr.hh b/src/libexpr/nixexpr.hh index 320d1dc977c5..43ac19f92a24 100644 --- a/src/libexpr/nixexpr.hh +++ b/src/libexpr/nixexpr.hh @@ -24,6 +24,7 @@ typedef ATerm Expr; typedef ATerm DefaultValue; typedef ATerm Pos; typedef ATerm Pattern; +typedef ATerm ATermBool; /* A STL vector of ATerms. Should be used with great care since it's -- cgit 1.4.1