Indeed, and my initial workaround was to force that through:
It may be related to: https://svn.boost.org/trac10/ticket/13108
(is_default_constructible support.)
Time to start muddying the waters.
(Note: the binary archives were taken from the latest serialization 'test'
code area.)
Some test code:
#include
#include
#include <fstream>
#if 1
#include "boost/portable_binary_iarchive.hpp"
#include "boost/portable_binary_oarchive.hpp"
typedef portable_binary_oarchive oarchive_type;
typedef portable_binary_iarchive iarchive_type;
std::ios_base::openmode flags = std::ios::binary;
#else
#include
#include
typedef boost::archive::text_oarchive oarchive_type;
typedef boost::archive::text_iarchive iarchive_type;
std::ios_base::openmode flags = std::ios_base::openmode();
#endif
#if (BOOST_VERSION >= 106400) && (__GNUC__*100 + __GNUC_MINOR__ == 406)
namespace boost { namespace serialization { namespace detail {
template <>
struct is_default_constructiblestd::string : boost::true_type {};
}}}
#endif
int main(int argc, char *argv[])
{
(void)argc; (void)argv;
{
std::ofstream ofs("/tmp/tmp.bin", std::ios::out | flags);
boost::optionalstd::string s = std::string("hello");
oarchive_type oa(ofs);
oa << s;
}
{
std::ifstream ifs("/tmp/tmp.bin", std::ios::in | flags);
boost::optionalstd::string s;
iarchive_type ia(ifs); // # CRASH for binary #
ia >> s;
}
}
To work around the static_assertion, I tried adding the (serialization)
specialization for is_default_constructiblestd::string.
This then gets everything to compile, and the text_archive version doesn't
have any problems.
However, the binary_archive version crashes when trying to de-serialize.
( basic_binary_iprimitive.ipp(107): s.resize(l); )
I was concerned that the specialization has activated something undesirable,
hence my question about the correct way forward...
--
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