c++ - overloading friend operator >> for template class - Stack Overflow

How do I get the user to assign the value to radius using the overloaded friend operator>>? I have no idea why I am getting this error. Only when I explicitly assign a value to r in the Circle

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Using fmt::format in overloading operator<< and then using spdlog causes build errors · Issue #1227 · gabime/spdlog · GitHub

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