What's the C++ equivalent of UINT32_MAX?

Not sure about uint32_t, but for fundamental types (bool, char, signed char, unsigned char, wchar_t, short, unsigned short, int, unsigned int, long, unsigned long, float, double and long double) you can use the numeric_limits templates via #include <limits>.

cout << "Minimum value for int: " << numeric_limits<int>::min() << endl;
cout << "Maximum value for int: " << numeric_limits<int>::max() << endl;

If uint32_t is a #define of one of the above than this code should work out of the box

cout << "Maximum value for uint32_t: " << numeric_limits<uint32_t>::max() << endl;

std::numeric_limits<T>::max() defines the maximum value for type T.

Well, uint32_t will always be 32 bit, and always be unsigned, so you can safely define it manually:

#define UINT32_MAX  (0xffffffff)

You can also do

#define UINT32_MAX  ((uint32_t)-1)