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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 >

	array( T, U... )		  (since C++17)

	  -> array<T, 1 + sizeof...(U)>;

	One  deduction guide is provided for std::array to provide an equivalent
     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 the 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 alternative,
							 //   creates	std::ar-
     ray<short, 3>
      }

http://cppreference.com 	   2024.06.10	    deductiongu...rstd::array(3)
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