From 65a97a2163e40019e911053fb1e50b22337af118 Mon Sep 17 00:00:00 2001
From: Robin Haberkorn <robin.haberkorn@googlemail.com>
Date: Sun, 3 Jan 2016 22:25:34 +0100
Subject: fixed optimizations for multiple consecutive arithmetic operators

 * we have to make sure that exactly the same function values are used
---
 applause.lua | 34 ++++++++++++++++------------------
 1 file changed, 16 insertions(+), 18 deletions(-)

diff --git a/applause.lua b/applause.lua
index d77f1cd..a568a4a 100644
--- a/applause.lua
+++ b/applause.lua
@@ -449,40 +449,38 @@ function Stream:__tostring()
 	return "{"..table.concat(t, ", ").."}"
 end
 
+-- NOTE: Named addOp() and similar functions below
+-- are necessary instead of lambdas so consecutive
+-- operations can be collapsed by ZipStream (which
+-- tests for function equivalence)
+local function addOp(x1, x2) return x1+x2 end
 function Stream.__add(op1, op2)
-	return ZipStream:new(function(x1, x2)
-		return x1+x2
-	end, op1, op2)
+	return ZipStream:new(addOp, op1, op2)
 end
 
+local function subOp(x1, x2) return x1-x2 end
 function Stream.__sub(op1, op2)
-	return ZipStream:new(function(x1, x2)
-		return x1-x2
-	end, op1, op2)
+	return ZipStream:new(subOp, op1, op2)
 end
 
+local function mulOp(x1, x2) return x1*x2 end
 function Stream.__mul(op1, op2)
-	return ZipStream:new(function(x1, x2)
-		return x1*x2
-	end, op1, op2)
+	return ZipStream:new(mulOp, op1, op2)
 end
 
+local function divOp(x1, x2) return x1/x2 end
 function Stream.__div(op1, op2)
-	return ZipStream:new(function(x1, x2)
-		return x1/x2
-	end, op1, op2)
+	return ZipStream:new(divOp, op1, op2)
 end
 
+local function modOp(x1, x2) return x1%x2 end
 function Stream.__mod(op1, op2)
-	return ZipStream:new(function(x1, x2)
-		return x1%x2
-	end, op1, op2)
+	return ZipStream:new(modOp, op1, op2)
 end
 
+local function powOp(x1, x2) return x1^x2 end
 function Stream.__pow(op1, op2)
-	return ZipStream:new(function(x1, x2)
-		return x1^x2
-	end, op1, op2)
+	return ZipStream:new(powOp, op1, op2)
 end
 
 function Stream:__unm()	return self:mul(-1) end
-- 
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