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std::initia...ializer_list(3) C++ Standard Libarystd::initia...ializer_list(3) NAME std::initializer_list::initializer_list - std::initializer_list::ini- tializer_list Synopsis initializer_list() noexcept; (since C++11) (until C++14) constexpr initializer_list() noexcept; (since C++14) Constructs an empty initializer list. Parameters (none) Complexity Constant Example // Run this code #include <iostream> #include <initializer_list> int main() { std::initializer_list<int> empty_list; std::cout << "empty_list.size(): " << empty_list.size() << '\n'; // create initializer lists using list-initialization std::initializer_list<int> digits {1, 2, 3, 4, 5}; std::cout << "digits.size(): " << digits.size() << '\n'; // special rule for auto means 'fractions' has the // type std::initializer_list<double> auto fractions = {3.14159, 2.71828}; std::cout << "fractions.size(): " << fractions.size() << '\n'; } Output: empty_list.size(): 0 digits.size(): 5 fractions.size(): 2 Notes Despite a lack of constructors, it is possible to create non-empty initializer lists. Instances of std::initializer_list are implicitly constructed when: * a braced-init-list is used in list-initialization, including function-call list initialization and assignment expressions (not to be confused with constructor initializer lists) * a braced-init-list is bound to auto, including in a ranged for loop http://cppreference.com 2022.07.31 std::initia...ializer_list(3)
NAME | Synopsis | Parameters | Complexity | Example | Output: | Notes
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