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To me, C++ template used the idea of duck typing, is this right? Does it mean all generic types referenced in template class or method are duck type?
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No, this is a different concept. duck typing is a method to find out the type of a dynamic typed container. C++ templates aren't dynamic typed, they get instantiated with a specific type.
Yes, you are right, but there is always some but. Even though C# is mostly strongly typed language (leaving aside the new keyword dynamic) there are some parts where the . NET uses duck typing instead of the traditional static strong type checking.
What languages support duck typing? Python and Ruby support duck typing, both of which are dynamic typed languages. In general, dynamic typed languages such as JavaScript and TypeScript support duck typing.
The name comes from the phrase, “If it walks like a duck and it quacks like a duck, then it must be a duck.” Duck typing is related to dynamic typing, where the type of the class of an object is going to be less important than the methods that it defines.
To me C++ templates are a compile-time version of duck typing. The compiler will compile e.g. Class and as long as your Duck has all needed types it will instantiate a class.
If something is not correct(e.g. copy constructor missing) the compilation fails. The counterpart in real ducktyping is a failure when you call a function with a non-duck type. And here it would occur at runtime.
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