constexpr reference unchecked_push_back( const T& value );
(1) (since C++26)constexpr reference unchecked_push_back( T&& value );
(2) (since C++26)Appends the given element value to the end of the container.
Equivalent to: return *try_push_back(std::forward<decltype(value)>(value));
1) The new element is initialized as a copy of value.
2) value is moved into the new element.
Before the call to these functions size() < capacity() must be true. Otherwise, the behavior is undefined.
No iterators or references are invalidated, except end(), which is invalidated if the insertion occurs.
T must meet the requirements of CopyInsertable in order to use overload (1). -T must meet the requirements of MoveInsertable in order to use overload (2). [edit] Return value
back(), i.e. a reference to the inserted element.
Constant.
[edit] ExceptionsAny exception thrown by initialization of inserted element.
If an exception is thrown for any reason, these functions have no effect (strong exception safety guarantee).
[edit] Notes [edit] Example#include <cassert>
#include <inplace_vector>
#include <string>
int main()
{
std::inplace_vector<std::string, 2> fauna;
std::string dog{"dog"};
auto& r1 = fauna.unchecked_push_back("cat"); // overload (1)
assert(r1 == "cat" and fauna.size() == 1);
auto& r2 = fauna.unchecked_push_back(std::move(dog)); // overload (2)
assert(r2 == "dog" and fauna.size() == 2);
assert(fauna[0] == "cat" and fauna[1] == "dog");
// fauna.unchecked_push_back("bug"); // undefined behavior: there is no space
}[edit] See also
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