Template variable leads to warning

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0

This code gives me the following warning in Clang and I am not sure why or if this is a problem. warning: variable 'M_PI<int>' has internal linkage but is not defined [-Wundefined-internal]

template <typename T>
constexpr T M_PI = T(3.1415926535897932);

template <typename T>
constexpr T CalcCircumference(T d)
{
    return d * M_PI<T>;
}

int main()
{
    return CalcCircumference(42);
}

asked 38 secs ago

Chris_F

791