I'm wondering how placement insertion works for pair-associative Boost.Container types.

  For example, given:

//[ex_code struct D { D(char,char) {} // Insert Boost.Move awareness here... }; boost::container::map my_map; //]

Will my_map.emplace(0, 't', 'p') call D('t', 'p') and move the object into the map?

  Will Boost.Unordered work the same way?

I've answered these questions but ran into another. Boost.Unordered `emplace()` calls return `std::pair` rather than `iterator`.  Furthermore, MSVC 2010's TR1.Unordered `emplace()` implementation accepts only one argument: `std::pair` in this case.  Is this expected? Cromwell D. Enage