Temporarily add SetNull/IsNull/GetCheapHash to base_uint

Also add a stub for arith_uint256 and its conversion functions,
for now completely based on uint256.

Eases step-by-step migration to blob.

1 files changed, 19 insertions, 0 deletions

diff --git a/src/arith_uint256.h b/src/arith_uint256.h
new file mode 100644
index 0000000000..3bb384ca8a
--- /dev/null
+++ b/src/arith_uint256.h
@@ -0,0 +1,19 @@
+#ifndef BITCOIN_ARITH_UINT256_H
+#define BITCOIN_ARITH_UINT256_H
+
+// Temporary for migration to opaque uint160/256
+#include "uint256.h"
+
+class arith_uint256 : public uint256 {
+public:
+    arith_uint256() {}
+    arith_uint256(const base_uint<256>& b) : uint256(b) {}
+    arith_uint256(uint64_t b) : uint256(b) {}
+    explicit arith_uint256(const std::string& str) : uint256(str) {}
+    explicit arith_uint256(const std::vector<unsigned char>& vch) : uint256(vch) {}
+};
+
+#define ArithToUint256(x) (x)
+#define UintToArith256(x) (x)
+
+#endif // BITCOIN_UINT256_H