id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
6778	directory_iterator and recursive_directory_iterator has inconsistent behavior with STL iterator when assignment operator=() is involved.	Chih-Yao Hsieh <josephsieh@…>	Beman Dawes	"For example, in std::vector, the following code shows that *vIterator_1 prints out intVec[1] and *vIteraotr_2 prints out intVec[0].  (The assignment operator=() does not make those two iterators link together...)
{{{
std::vector<int> intVec(10);
intVec[1] = 1;
std::vector<int>::iterator vIterator_1 = intVec.begin();

// iterator assignment operator=() now get involved.
std::vector<int>::iterator vIterator_2 = vIterator_1;  
++vIterator_1;  // vIterator_2 does not increment.
std::cout << ""*vIterator_1: "" << *vIterator_1;
std::cout << ""*vIterator_2: "" << *vIterator_2;
}}}

On the other hand, the following example shows that dirIterator1->path() and dirIterator2->path() both contains '/home/user/test/2.txt' which is not consistent with STL iterator behavior. Since iterators behaves like pointers, after calling vIterator_2 = vIterator_1;, vIterator_2 and vIterator_1 should stays independent.  The problem seems to be directory_iterator forgot to implement the copy constructor and assignment operator=().

{{{
// assuming that under /home/user/test, there are 1.txt and 2.txt
boost::filesystem::path rootPath(""/home/user/test"");
boost::filesystem::directory_iterator dirIterator1(rootPath);

// Now assignment operator=() got involved.
boost::filesystem::directory_iterator dirIterator2 = dirIterator1;

// This line causes dirIterator1 and dirIterator2 both got incremented ...
++dirIterator1;  

std::cout << ""dirItertor1: "" << dirIterator1->path().string() << std::endl;
std::cout << ""dirItertor2: "" << dirIterator2->path().string() << std::endl;
}}}


== Note ==
The symptom occurred in:

boost::filesystem::directory_iterator[[BR]]
boost::filesystem2::directory_iterator[[BR]]
boost::filesystem3::directory_iterator[[BR]]
boost::filesystem::recursive_directory_iterator[[BR]]
boost::filesystem2::recursive_directory_iterator[[BR]]
boost::filesystem3::recursive_directory_iterator[[BR]]

under all platforms."	Bugs	new	To Be Determined	filesystem	Boost 1.49.0	Problem		directory_iterator, recursive_directory_iterator, assignment operator=()