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Showing content from https://en.cppreference.com/w/cpp/language/../../cpp/container/inplace_vector/emplace_back.html below:

std::inplace_vector<T,N>::emplace_back - cppreference.com

template< class... Args > constexpr reference emplace_back( Args&&... args );

(since C++26)

Appends a new element to the end of the container. Typically, the element is constructed using placement-new to construct the element in-place at the location provided by the container. The arguments args... are forwarded to the constructor as std::forward<Args>(args)....

No iterators or references are invalidated, except end(), which is invalidated if the insertion occurs.

[edit] Parameters args - arguments to forward to the constructor of the element Type requirements -T must meet the requirements of EmplaceConstructible. [edit] Return value

back(), i.e. a reference to the inserted element.

[edit] Complexity

Constant.

[edit] Exceptions

std::bad_alloc if size() == capacity() before invocation.
Any exception thrown by initialization of the inserted element.

If an exception is thrown for any reason, these functions have no effect (strong exception safety guarantee).

[edit] Example

Possible output:

fauna = [("ð", "ð"), ("ð", "ð")]
std::bad_alloc
fauna = [("ð", "ð"), ("ð", "ð")]

[edit] See also

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