Tan, Tom (Shanghai) wrote:

While trying to read \boost\fusion adapt_struct.hpp and understand the internals of BOOST_FUSION_ADAPT_STRUCT. I came across this code:

namespace boost { namespace mpl \

{ \

template<typename> \

struct +; \

\

//….

}}

Can anyone please explain what “ template<typename> struct +; “

means here? I am puzzled how it ever compiles as an operator is used as a class name.

I don't see this in adapt_struct.hpp. Which version of Boost are you finding this in ?