code. compile. run. debug. share.
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#include <iostream>
#include <type_traits>
int main()
{
std::cout << std::boolalpha;
int x = 10;
std::cout << std::is_same_v<decltype(x), int> << '\n';
std::cout << std::is_same_v<decltype(++x), int&> << '\n';
std::cout << std::is_same_v<decltype(x++), int> << '\n';
std::cout << std::is_same_v<decltype( (x) ), int&> << '\n'; // important
std::cout << std::is_same_v<decltype(x + 4 ), int> << '\n';
const int cx = 5;
std::cout << std::is_same_v<decltype(cx), const int> << '\n';
const int* ptr = &x;
std::cout << std::is_same_v<decltype(ptr), const int*> << '\n';
const int* const cptr = &x;
std::cout << std::is_same_v<decltype(cptr), const int* const> << '\n';
int arr[5];
std::cout << std::is_same_v<decltype(arr), int[5]> << '\n';
std::cout << std::is_same_v<decltype(arr), int[6]> << '\n'; // FALSE
int* p = &x;
std::cout << std::is_same_v<decltype(p), int*> << '\n';
std::cout << std::is_same_v<decltype(*p), int&> << '\n';
}
Compiling Program...
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