Re: [Boost-users] [container] associative placement insertion

Subject: Re: [Boost-users] [container] associative placement insertion
From: Cromwell Enage (sponage_at_[hidden])
Date: 2011-12-17 00:16:07

> 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<int,D> 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<iterator,bool>` rather than `iterator`.  Furthermore, MSVC 2010's TR1.Unordered `emplace()` implementation accepts only one argument: `std::pair<int,D>` in this case.  Is this expected?

Cromwell D. Enage