Just recently embraced user-defined literals for my strongy-typed units of time (e.g. 10_ms, 100_us, 1_ns). My time types have always required explicit constructors to make call sites clear and this outcome is the best of all worlds. Except the extra function call, of course...
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literals can be marked constexpr and if they are assigned to a constexpr value, they will be evaluated in constexpr just like any other function. This doesn't help when doing "MyFunction(10_us)". You'd have to hoist the 10_us up into a constexpr first. =(
I use hash literals (something like "someString"_hash), and it works in case statements and explicitly declared constexpr values. But what I often want is "FindAnimation("anim"_hash)" or something like that. Unfortunately doesn't even work in release on msvc. =(
