compile-time 64-bit string hashing, based on murmurhash3.
With C++11 constexpr and user-defined-literals facilities it is possible to create compile-time string hashing functions.
As of writing this, with murmurhash3 it is possible to generate either a 32- or 128-bit hashes. My preference was to have a 64-bit hash, so I took 32-bit murmurhash3 algorithm (https://en.wikipedia.org/wiki/MurmurHash#Algorithm) and tweaked it into a 64-bit version using constants taken from the 128-bit version. Specifically: c1 := 0x87c37b91114253d5 c2 := 0x4cf5ad432745937f r1 := 31 r2 := 27 m := 5 n := 0x52dce729 I haven't evaluated whether this set makes sense, so use it at your own risk... The finalizer piece was taken entirely from murmurhash3-128.