Re: [boost] [any] new version

Subject: Re: [boost] [any] new version
From: Ilya Bobir (ilya.bobir_at_[hidden])
Date: 2011-08-31 20:55:11

On Wed, Aug 31, 2011 at 5:16 PM, Martin Bidlingmaier
<Martin.Bidlingmaier_at_[hidden]> wrote:
> Hi,
>
> [...] It does not depend on rtti and uses a static integer value instead of std::type_info to store type information.
> [...]

Quote from any.hpp:

    //use static class member to force initialization at program start
to make type_id thread safe (and more efficient)
    template< class T >
    class type_id
    {
    public:
        static unsigned int value;
    };
    template< class T >
    unsigned int type_id< T >::value = next_id();

I do not think you can initialize a class static in a header.  If you
include any.hpp in more than one cpp you will have the same static
been initialized more than once.
MS C++ linker complains.  Though the standard requires no diagnostic.
See "9.4.2 Static data members" paragraph 5.

Ilya Bobyr