How to do it...

Variables are initialized in one step. Using the initializer syntax, there are two different situations:

• Using the brace initializer syntax without auto type deduction:

       // Three identical ways to initialize an int:
       int x1 = 1;
       int x2  {1};
       int x3  (1);
       
       std::vector<int> v1   {1, 2, 3}; // Vector with three ints: 1, 2, 3
       std::vector<int> v2 = {1, 2, 3}; // same here
       std::vector<int> v3   (10, 20);  // Vector with 10 ints, 
                                        // each have value 20

• Using the brace initializer syntax with auto type deduction:

 auto v {1}; // v is int
 auto w {1, 2}; // error: only single elements in direct 
 // auto initialization allowed! (this is new)
 auto x = {1}; // x is std::initializer_list<int>
 auto y = {1, 2}; // y is std::initializer_list<int>
 auto z = {1, 2, 3.0}; // error: Cannot deduce element type