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PO
primarykey
Id
2234678
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
2
CommunityOwnedDate
CreationDate
2010-02-10T05:37:24.803
FavoriteCount
0
LastActivityDate
2011-11-27T05:04:40.270
LastEditDate
2011-11-27T05:04:40.270
LastEditorUserId
87234
OwnerUserId
87234
ParentId
2234508
PostTypeId
2
Score
7
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0
LastEditorDisplayName
text
Body
Boost lambda will evaluate <code>rand</code> before the functor is made. You need to <code>bind</code> it, so it's evaluated at lambda evaluation time: <pre><code>#include <boost/lambda/lambda.hpp> #include <boost/lambda/bind.hpp> // for bind #include <algorithm> #include <cstdlib> #include <ctime> #include <iostream> #include <vector> int main() { namespace bl = boost::lambda; typedef std::vector<int> int_vec; static const size_t MaxListSize = 10; static const int MaxSize = 20; int_vec theList; theList.resize(MaxListSize); std::srand(static_cast<unsigned>(std::time(0))); std::for_each(theList.begin(), theList.end(), bl::_1 = bl::bind(std::rand) % MaxSize); std::for_each(theList.begin(), theList.end(), std::cout << bl::_1 << ' ' ); } </code></pre> This works as expected. However, the correct solution is to use <code>generate_n</code>. Why make a bunch of 0's just to overwrite them? <pre><code>#include <boost/lambda/lambda.hpp> #include <boost/lambda/bind.hpp> #include <algorithm> #include <cstdlib> #include <ctime> #include <iostream> #include <vector> int main() { namespace bl = boost::lambda; typedef std::vector<int> int_vec; static const size_t MaxListSize = 10; static const int MaxSize = 20; int_vec theList; theList.reserve(MaxListSize); // note, reserve std::srand(static_cast<unsigned>(std::time(0))); std::generate_n(std::back_inserter(theList), MaxListSize, bl::bind(std::rand) % MaxSize); std::for_each(theList.begin(), theList.end(), std::cout << bl::_1 << ' ' ); } </code></pre>
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singulars
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1. This table or related slice is empty.
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1. POInitialization of list with for_each to random variables
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1. PTAnswer
UserLastEditorUserId
1. USGManNickG
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1. USGManNickG
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1. POInitialization of list with for_each to random variables
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1. VO
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2. VO
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3. VO
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CommentsPostId
1. COThank you, Roger. :)
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2. COAhh, nice one that's a great response.
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 USDemps

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