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* lessThan primitive for integer comparison.

This commit is contained in:
Eelco Dolstra 2006-09-24 15:21:48 +00:00
parent 2ab4bc44c7
commit df8873e14a
2 changed files with 13 additions and 1 deletions
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9
src/libexpr/primops.cc
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@ -779,6 +779,14 @@ static Expr primAdd(EvalState & state, const ATermVector & args)
}
static Expr primLessThan(EvalState & state, const ATermVector & args)
{
int i1 = evalInt(state, args[0]);
int i2 = evalInt(state, args[1]);
return makeBool(i1 < i2);
}
void EvalState::addPrimOps()
{
addPrimOp("builtins", 0, primBuiltins);
@ -810,6 +818,7 @@ void EvalState::addPrimOps()
addPrimOp("removeAttrs", 2, primRemoveAttrs);
addPrimOp("relativise", 2, primRelativise);
addPrimOp("__add", 2, primAdd);
addPrimOp("__lessThan", 2, primLessThan);
}

5
tests/lang/eval-okay-arithmetic.nix
View File

@ -2,7 +2,10 @@ with import ./lib.nix;
let {
range = first: last: [first] ++ (if first == last then [] else range (builtins.add first 1) last);
range = first: last:
if builtins.lessThan last first
then []
else [first] ++ range (builtins.add first 1) last;
/* Supposedly tail recursive version: