Re: [Boost-users] [Boost.Fusion] Compile-time callbacks.

On Tue, Jul 29, 2008 at 5:34 PM, Vjekoslav Brajkovic wrote:

As I have sad before, I'm not particularly familiar with MPL/Fusion, so any clarifications are very welcome. For instance, the document specifies: "It is named "fusion" because the library is reminiscent of the "fusion" of compile time meta-programming with runtime programming.", but it does not specify which part is compile and which is run-time.

The types are compile-time and the values are run-time. With most fusion containers (say, fusion::vector), each element has a compile time type and a value that can be changed at run-time (this is where it differs from MPL). Maps/pairs are a slight departure from the rest in that the first element of a fusion::pair (the key) does not have a value associated with it, only the type. Stjepan