Conditional compilation based on template values?

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Since C++17 there is static if which is called if-constexpr. The following compiles fine since clang-3.9.1 and gcc-7.1.0, latest MSVC compiler 19.11.25506 handles well too with an option /std:c++17.

template<class T> double doit(T &t) {
    if constexpr (std::is_same_v<T, AA>)
        return t.Plus(t);
    else
        return t + t;
}

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