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From: "darkdragon-001 at web dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/63753] New: std::transform does not change size
Date: Wed, 05 Nov 2014 18:29:00 -0000	[thread overview]
Message-ID: <bug-63753-4@http.gcc.gnu.org/bugzilla/> (raw)

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63753

            Bug ID: 63753
           Summary: std::transform does not change size
           Product: gcc
           Version: 4.9.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: darkdragon-001 at web dot de

When using std::transform with a OutputIterator to std::vector then the vector
size is not updated (see code attached):

#include <algorithm>
#include <iostream>
#include <vector>

using namespace std;

int main() {
  vector<double> v = {1,2,3,4,5};
  vector<double> r;
  r.reserve(v.size());
  transform(v.begin(),v.end(),r.begin(),[](const double& d) {
    return 2*d;
  });
  cout << "size:" << r.size() << "front:" << r.front() << endl;

  return 0;
}


             reply	other threads:[~2014-11-05 18:29 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-11-05 18:29 darkdragon-001 at web dot de [this message]
2014-11-05 22:15 ` [Bug libstdc++/63753] " glisse at gcc dot gnu.org

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