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Subject: [boost] no match for ‘operator=’ error with circular_buffer iterator when addressing buffer by reference?
From: Bernd Prager (bernd_at_[hidden])
Date: 2012-01-07 23:13:55

I am trying do use a circular_buffer iterator and run into problems when
I try to write a copy constructor for my class.

g++ (GCC) 4.5.3 generates following error:

Test.cpp: In copy constructor ‘Test::Test(const Test&)’:
Test.cpp:23:18: error: no match for ‘operator=’ in ‘it2 =
boost::circular_buffer<T, Alloc>::begin() const [with T = int, Alloc =
std::allocator<int>, boost::circular_buffer<T, Alloc>::const_iterator =
boost::cb_details::const_traits<std::allocator<int> > >]()’
/usr/local/include/boost/circular_buffer/details.hpp:253:15: note:
candidate is: boost::cb_details::iterator<Buff, Traits>&
boost::cb_details::iterator<Buff, Traits>::operator=(const
boost::cb_details::iterator<Buff, Traits>&) [with Buff =
boost::circular_buffer<int>, Traits =
boost::cb_details::nonconst_traits<std::allocator<int> >,
boost::cb_details::iterator<Buff, Traits> =
boost::cb_details::nonconst_traits<std::allocator<int> > >]

What do I miss. Can anybody help?
Thank you,
-- Bernd

#include <boost/circular_buffer.hpp>

class Test {
    Test(const Test&);

    boost::circular_buffer<int> b;

Test::Test() {

Test::Test(const Test &t) {

    size_t s1 = b.size();
    size_t s2 = t.b.size();

    boost::circular_buffer<int>::iterator it1 = b.begin();
    boost::circular_buffer<int>::iterator it2 = t.b.begin();

int main() {
    Test *t = new Test();
    return 0;

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