A value that is both bool(true) and EXIT_SUCCESS.

tautology.cpp

#include <cstdio>

int main() {
	constexpr auto tautology{1ull << 63};

	if (tautology)
		std::puts("raw value evaluates to true");

	if (static_cast<bool>(tautology))
		std::puts("bool conversion equals true");

	// process exits with EXIT_SUCCESS
	return static_cast<int>(tautology);
}