delete uneeded code, replace with bc::hash_literal as per William Swanson (s_tec)'s comment.

code/merkle.cpp

@@ -47,21 +47,13 @@ bc::hash_digest create_merkle(bc::hash_list& merkle)
     return merkle[0];
 }
 
-// Convert hex string to hash bytes.
-bc::hash_digest get_hash(const std::string& value)
-{
-    bc::hash_digest result;
-    bool success = bc::decode_hash(result, value);
-    return result;
-}
-
 int main()
 {
     // Replace these hashes with ones from a block to reproduce the same merkle root.
     bc::hash_list tx_hashes{{
-        get_hash("0000000000000000000000000000000000000000000000000000000000000000"),
-        get_hash("0000000000000000000000000000000000000000000000000000000000000011"),
-        get_hash("0000000000000000000000000000000000000000000000000000000000000022"),
+        bc::hash_literal("0000000000000000000000000000000000000000000000000000000000000000"),
+        bc::hash_literal("0000000000000000000000000000000000000000000000000000000000000011"),
+        bc::hash_literal("0000000000000000000000000000000000000000000000000000000000000022"),
     }};
     const bc::hash_digest merkle_root = create_merkle(tx_hashes);
     std::cout << "Result: " << bc::encode_hex(merkle_root) << std::endl;