<html>
    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - vector::insert(pos, iter, iter) incorrectly requires value-assignment for forward_iterators."
   href="https://bugs.llvm.org/show_bug.cgi?id=34906">34906</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>vector::insert(pos, iter, iter) incorrectly requires value-assignment for forward_iterators.
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>libc++
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>unspecified
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Windows NT
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>All Bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedclangbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>eric@efcs.ca
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org, mclow.lists@gmail.com
          </td>
        </tr></table>
      <p>
        <div>
        <pre>According to the spec, this overload of `insert` doesn't require that the
elements in the vector be assignable from the iterator value_type. However
libc++ currently requires this.

Example: 

// clang++ -stdlib=libc++ -std=c++11 test.cpp
#include <vector>

template <class T>
  struct EmplaceConstructibleAndMoveable {
    explicit EmplaceConstructibleAndMoveable(T) {}
    EmplaceConstructibleAndMoveable(EmplaceConstructibleAndMoveable&&) =
default;
    EmplaceConstructibleAndMoveable&
operator=(EmplaceConstructibleAndMoveable&&)  = default;
 };

 int main() {
    using T = EmplaceConstructibleAndMoveable<int>;
    std::vector<T> v;
    int Inits[] = {1, 2, 3};
    v.insert(v.end(), std::begin(Inits), std::end(Inits));
}</pre>
        </div>
      </p>


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