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
#include
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::
__copy_m(_II, _II, _OI) [with _II =
boost::container::constant_iterator, _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, _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,
_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, _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, F =
data*]
boost/container/detail/advanced_insert_int.hpp:58: instantiated from
void boost::container::container_detail::advanced_insert_aux_proxy::copy_remaining_to(Iterator)
[with A = std::allocator<data>, FwdIt =
boost::container::constant_iterator, 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::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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