Tweaked a C++ integer cast.

cpp/QrCode.cpp

@@ -287,7 +287,7 @@ void QrCode::drawVersion() {
 	int rem = version;  // version is uint6, in the range [7, 40]
 	for (int i = 0; i < 12; i++)
 		rem = (rem << 1) ^ ((rem >> 11) * 0x1F25);
-	long bits = (long)version << 12 | rem;  // uint18
+	long bits = static_cast<long>(version) << 12 | rem;  // uint18
 	if (bits >> 18 != 0)
 		throw std::logic_error("Assertion error");