File: cxx17.cpp

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#if __cplusplus >= 201703L || (defined(_MSC_VER) && _MSC_VER >= 1914)
// OK
#else
#error "C++17 is not supported"
#endif

#include <iostream>
#include <memory>

template <typename T> auto get_value(T t)
{
  if constexpr (std::is_pointer_v<T>)
    return *t;
  else
    return t;
}

int main()
{
  auto pi = std::make_unique<int>(9);
  int i = 9;

  std::cout << get_value(pi.get()) << "\n";
  std::cout << get_value(i) << "\n";
}