Перевести код из php в c++

Помогите пожалуйста перевести код из php в c++, и добавить в этот код классы
alex,1,5.0
alex,2,3.0
alex,5,4.0
ivan,1,4.0
ivan,6,1.0
ivan,8,2.0
ivan,9,3.0
bob,2,5.0
bob,3,5.0
david,3,4.0
david,4,3.0
david,6,2.0
david,7,1.0
import csv
def ReadFile (filename = "<csv_file_location>"):
f = open (filename)
r = csv.reader (f)
mentions = dict()
for line in r:
user = line[0]
product = line[1]
rate = float(line[2])
if not user in mentions:
mentions[user] = dict()
mentions[user][product] = rate
f.close()
return mentions
def distCosine (vecA, vecB):
def dotProduct (vecA, vecB):
d = 0.0
for dim in vecA:
if dim in vecB:
d += vecA[dim]*vecB[dim]
return d
return dotProduct (vecA,vecB) / math.sqrt(dotProduct(vecA,vecA)) / math.sqrt(dotProduct(vecB,vecB))
import math
def makeRecommendation (userID, userRates, nBestUsers, nBestProducts):
matches = [(u, distCosine(userRates[userID], userRates[u])) for u in userRates if u <> userID]
bestMatches = sorted(matches, key=lambda(x,y)y,x), reverse=True)[:nBestUsers]
print "Most correlated with '%s' users:" % userID
for line in bestMatches:
print " UserID: %6s Coeff: %6.4f" % (line[0], line[1])
sim = dict()
sim_all = sum([x[1] for x in bestMatches])
bestMatches = dict([x for x in bestMatches if x[1] > 0.0])
for relatedUser in bestMatches:
for product in userRates[relatedUser]:
if not product in userRates[userID]:
if not product in sim:
sim[product] = 0.0
sim[product] += userRates[relatedUser][product] * bestMatches[relatedUser]
for product in sim:
sim[product] /= sim_all
bestProducts = sorted(sim.iteritems(), key=lambda(x,y)y,x), reverse=True)[:nBestProducts]
print "Most correlated products:"
for prodInfo in bestProducts:
print " ProductID: %6s CorrelationCoeff: %6.4f" % (prodInfo[0], prodInfo[1])
return [(x[0], x[1]) for x in bestProducts]

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