Я искал в do c
https://www.boost.org/doc/libs/1_69_0/doc/html/property_tree.html и в заголовке boost-1.69.0 / include / boost / property_tree / ptree.hpp, но не смог найти сложность ( большой O) push_back:
/** Equivalent to insert(end(), value). */
iterator push_back(const value_type &value);
/** Insert a copy of the given tree with its key just before the given
* position in this node. This operation invalidates no iterators.
* @return An iterator to the newly created child.
*/
iterator insert(iterator where, const value_type &value);
Я пропустил документ / страницу? Вид