inline template function?
You do, because those are full function specializations, and therefore subject to the one-definition rule just like normal functions.
template-function
Why doesn’t ADL find function templates?
This part explains it: C++ Standard 03 14.8.1.6: [Note: For simple function names, argument dependent lookup (3.4.2) applies even when the function name is not visible within the scope of the call. This is because the call still has the syntactic form of a function call (3.4.1). But when a function template with explicit template … Read more