Re: [boost] [any] Infinite loop in boost::any in boost release 1.54.0 using Visual C++ 2010

9 Oct 2013

      2013/10/8 Bo Peng <elapsing@gmail.com>
...
This very simple code:
#include <boost/any.hpp>
#include <string>
const boost::any getBoolVal()
{
    return false;
}
int main()
{
    boost::any vals[] = {1.0, std::string("1m"), getBoolVal()};
}
When built using Visual C++ 2010, it will run into a infinite loop:
<...>

Thanks for finding that issue. I'll take care of it.

Code at line 70 in boost/any.hpp must look like this:

        template<typename ValueType>
        any(ValueType&& value
            , typename boost::disable_if<boost::is_same<any&, ValueType>
...
::type* = 0 // disable if value has type `any&`
            , typename boost::disable_if<boost::is_const<ValueType>
::type* = 0) // disable if value has type `const ValueType&&`
          : content(new holder< typename remove_reference<ValueType>::type
(static_cast<ValueType&&>(value)))
        {
        }
Otherwise there'll be infinite loop with `any(const any&&)` and
`any::holder(const ValueType&)`, that calls for copy constructor of
ValueType.

Created a ticket for that bug: https://svn.boost.org/trac/boost/ticket/9215

-- 
Best regards,
Antony Polukhin