[Boost-users] boost::container::vector fails to compile with C++03 compiler

Subject: [Boost-users] boost::container::vector fails to compile with C++03 compiler
From: mark pashley (mark.pashley_at_[hidden])
Date: 2012-10-26 04:47:55

The following example compiles fine when using GCC 4.4.6 with the --std=c++0x
flag but fails to compile in C++03 mode.

#include <stdint.h>
#include <boost/container/vector.hpp>

struct data
{
   int               i_;
   boost::container::vector<data>      v_;
};

int main( int argc, char** argv )
{
    data myData;
    myData.i_ = 10;

    data myData2;
    myData2.i_ = 30;

    myData.v_.push_back( myData2 );

    return 0;
}

It compiles successfully with

 g++ --std=c++0x test-cont.cpp

However if I remove the --std=c++0x I get the following errors: g++
test-cont.cpp In file included from include/c++/4.4.6/memory:49,
boost/container/container_fwd.hpp:36, boost/container/vector.hpp:20, from
test-cont.cpp:2:

include/c++/4.4.6/bits/stl_algobase.h: In static member function 
    static _OI std::__copy_move<false, false,
std::random_access_iterator_tag>::
        __copy_m(_II, _II, _OI) [with _II = 
            boost::container::constant_iterator<data, long int>, _OI =
data*]:

include/c++/4.4.6/bits/stl_algobase.h:397:   instantiated from 
    _OI std::__copy_move_a(_II, _II, _OI) 
        [with bool _IsMove = false, 
                   _II = boost::container::constant_iterator<data, long
int>, _OI = data*]

include/c++/4.4.6/bits/stl_algobase.h:436:   instantiated from 
    _OI std::__copy_move_a2(_II, _II, _OI) 
    [with bool _IsMove = false, 
               _II = boost::container::constant_iterator<data, long int>,
_OI = data*]

include/c++/4.4.6/bits/stl_algobase.h:468:   instantiated from 
    _OI std::copy(_II, _II, _OI) 
        [with _II = boost::container::constant_iterator<data, long int>, _OI
= data*]

boost/move/move.hpp:1147:   instantiated from 
    boost::copy_or_move(I, I, F, 
        typename boost::move_detail::disable_if<
boost::move_detail::is_move_iterator, void>::type*) 
        [with I = boost::container::constant_iterator<data, long int>, F =
data*]

boost/container/detail/advanced_insert_int.hpp:58:   instantiated from 
    void boost::container::container_detail::advanced_insert_aux_proxy<A,
FwdIt, Iterator>::copy_remaining_to(Iterator) 
    [with A = std::allocator<data>, FwdIt =
boost::container::constant_iterator<data, long int>, Iterator = data*]

test-cont.cpp:21:   instantiated from here

include/c++/4.4.6/bits/stl_algobase.h:343: error: 
    no match for operator= in * __result = 
        __first.boost::container::constant_iterator<T,
Difference>::operator* 
        [with T = data, Difference = long int]()

test-cont.cpp:5: note: candidates are: data& data::operator=(data&)

It looks like boost::container::vector requires move semantics which I
assumed would automatically use boost::move when compiled with a c++03
compiler.

If I manually modify the struct data to define:

a default constructor
a copy constructor
an assignment operator
an emulated move constructor using BOOST_RV_REF
an emulated move assignment operator using BOOST_RV_REF

The example compiles.

Having to manually add these move/copy constructors and assignment operators
for C++03 is laborious.

Is this a bug with boost::container?

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