https://svn.boost.org/trac10/ticket/2087 <p> when a fusion container is initialized, the objects in the container are constructed and after that copied (using the copy constructor). an in-place initialization would allow to have a fusion container of non-copy-constructible types as the copy construction would not be necessary anymore. (fusion sequence of non-copy-constructible types are not currently supported.) using an in-place solution should also be more efficient. </p> en-us /htdocs/site/boost.png https://svn.boost.org/trac10/ticket/2087 Trac 1.4.3