Merge pull request #18 from kuszmaul/bck-use-a-singleton

Don't use a symbol for the never-cached value

Author: nickrobinson251

Project.toml

@@ -1,7 +1,7 @@
 name = "MultiThreadedCaches"
 uuid = "18056a9e-ed0c-4ef3-9ad7-376a7fb08032"
 authors = ["Nathan Daly <nhdaly@gmail.com> and contributors"]
-version = "0.1.4"
+version = "0.1.5"
 
 [compat]
 julia = "1.3"

src/MultiThreadedCaches.jl

@@ -118,7 +118,8 @@ function _thread_lock(cache::MultiThreadedCache, tid)
 end
 
 
-const CACHE_MISS = :__MultiThreadedCaches_key_not_found__
+struct NeverCached end
+const CACHE_MISS = NeverCached()
 
 function Base.get!(func::Base.Callable, cache::MultiThreadedCache{K,V}, key) where {K,V}
     # If the thread-local cache has the value, we can return immediately.