Zero size values support

[tvoeroes]

Hello, I am wondering if there is a reason for disallowing zero size values? I have noticed that the insert code contains BOOST_ASSERT(size > 0);. I think that the database could/should let the user store zero size values.

[vinniefalco]

NuDB is designed as a content-addressable storage system. The digest of a zero-length message is always the same. So you would have at most one possible record with zero length. What is your use-case?

[tvoeroes]

My use-case would include having different keys resolving to the same value, including multiple keys possibly resolving to the zero-length value. At first glance it seems to be working when I disable boost asserts.

Think of

std::unordered_map<int, std::string> map;
map[0] = "foo";
map[1] = "";
map[2] = "foo";
map[3] = "";

[vinniefalco]

Are you aware that NuDB is append-only? You can't change entries.

[tvoeroes]

Yes