There is no true equivalent of push_front(X) for maps (or any of the other
sorted-associative containers) because X may end up at someplace other
than the beginning of the map depending in its relation to the other elements
in the map.
If X is the smallest element among the elements in the map m, then
m.insert(m.begin(), X) is equivalent to m.push_front(X).
This page last modified on 12 March 2004.