type deduction in auto

type_deduction_in_auto.cpp

// ----------------------------------
// example 1
auto x = 26;           // x is int
const auto cx = x;     // cx is const int
const auto& rx = x;    // rx is const int&
auto&& uref1 = x;      // uref1 is int&
auto&& uref2 = cx;     // uref2 is const int&
auto&& uref3 = 27;     // uref3 is int&&

// ----------------------------------
// example 2
const char name[] = "Takkar";
auto arr1 = name;      // arr1 is const char*
auto& arr2 = name;     // arr2 is const char(&)[7]

// ----------------------------------
// example 3
void some(int, double);
auto f1 = some;        // f1 is void (*)(int, double);
auto& f2 = some;       // f2 is void (&)(int, double);

// ----------------------------------
// example 4
int x = {3};           // x is int, value is 3.
auto y = {3};          // y is std::initializer_list<int>
auto z{3};             // z is std::initializer_list<int>

// ----------------------------------
// example 5
auto x = {3, 4, 5};    // x is std::initializer_list<int>