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int x = fromString("test") :could not deduce template argument for ‘ValueType’
int x = fromString<int>("test") : works fine as expected
So why does the compiler struggle here? I see it with all kinds of real template functions, not just this silly example. It must be a feature of the language, but what?
C++ doesn’t do type inference on the return value. I.e., the fact that it is being assigned to an int isn’t used in template parameter deduction.
(Removed edit, since someone else presented the overloaded cast solution already.)