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* Some hacks to simulate conventional laziness.

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This commit is contained in:
Eelco Dolstra 2007-10-11 21:58:37 +00:00
parent cd9d10d4e3
commit 981afe821c
7 changed files with 47 additions and 10 deletions
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14
src/libexpr/nixexpr.cc
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@ -2,6 +2,7 @@
#include "derivations.hh"
#include "util.hh"
#include "aterm.hh"
#include "eval.hh" // !!! urgh
#include "nixexpr-ast.hh"
#include "nixexpr-ast.cc"
@ -399,5 +400,18 @@ string showValue(Expr e)
return "<unknown>";
}
static unsigned int cellCount = 0;
Expr allocCell(Expr e)
{
if (cacheTerms != 2) return e;
int i;
Expr e2;
if (matchCell(e, i, e2)) return e;
return makeCell(cellCount++, e);
}
}