(C++17) | ||||
| Sequence | ||||
(C++11) | ||||
(C++26) | ||||
(C++26) | ||||
(C++11) | ||||
| Associative | ||||
| Unordered associative | ||||
(C++11) | ||||
(C++11) | ||||
(C++11) | ||||
(C++11) | ||||
| Adaptors | ||||
(C++23) | ||||
(C++23) | ||||
(C++23) | ||||
(C++23) | ||||
| Views | ||||
(C++20) | ||||
(C++23) | ||||
| Tables | ||||
| Iterator invalidation | ||||
| Member function table | ||||
| Non-member function table |
template<class...Args> std::pair<iterator,bool> emplace( Args&&...args); | (since C++23) (constexpr since C++26) | |
Inserts a new element into the container constructed in-place with the givenargs, if there is no element with the key in the container.
First, initializes an objectt of typevalue_type withstd::forward<Args>(args)..., then insertst as if byauto it=ranges::upper_bound(c, t, compare);c.insert(it, std::move(t));
This overload participates in overload resolution only ifstd::is_constructible_v<value_type, Args...> istrue.
Ifvalue_type is notEmplaceConstructible intoflat_set fromargs, the behavior is undefined.
| Information on iterator invalidation is copied fromhere |
Contents |
| args | - | arguments to forward to the constructor of the element |
A pair consisting of an iterator to the inserted element (or to the element that prevented the insertion) and abool value set totrue if and only if the insertion took place.
If an exception is thrown for any reason, this function has no effect (strong exception safety guarantee).
Logarithmic in the size of the container.
Careful use ofemplace allows the new element to be constructed while avoiding unnecessary copy or move operations.
| This section is incomplete Reason: no example |
| constructs elements in-place using a hint (public member function)[edit] | |
| inserts elements (public member function)[edit] |
