std::initializer_list::size (3) Linux Manual Page

std::initializer_list<T>::size – std::initializer_list<T>::size

Synopsis

size_type size() const noexcept; (since C++11)
                                            (until C++14)
constexpr size_type size() const noexcept; (since C++14)
Returns the number of elements in the initializer list, i.e. std::distance(begin(), end()).

Parameters

(none)

Return value

the number of elements in the initializer list

Complexity

Constant