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deductiongu...rstd::array(3) C++ Standard Libary deductiongu...rstd::array(3) NAME deductionguidesforstd::array - deductionguidesforstd::array Synopsis Defined in header <array> template <class T, class... U> (since C++17) array(T, U...) -> array<T, 1 + sizeof...(U)>; One deduction guide is provided for std::array to provide an equiva- lent of std::experimental::make_array for construction of std::array from a variadic parameter pack. The program is ill-formed if (std::is_same_v<T, U> && ...) is not true. Note that (std::is_same_v<T, U> && ...) is true when sizeof...(U) is zero. Example // Run this code #include <array> #include <cassert> int main() { int const x = 10; std::array a{1, 2, 3, 5, x}; // OK, creates std::array<int, 5> assert(a.back() == x); // std::array b{1, 2u}; // Error, all arguments must have same type // std::array<short> c{3, 2, 1}; // Error, wrong number of template args std::array c(std::to_array<short>({3, 2, 1})); // C++20 alterna- tive, creates std::array<short, 3> } http://cppreference.com 2022.07.31 deductiongu...rstd::array(3)
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