Function vecmath::vec4_len
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pub fn vec4_len<T>(a: Vector4<T>) -> T where T: Copy + Sqrt + Add<T, Output=T> + Mul<T, Output=T>Computes the length of vector.
pub fn vec4_len<T>(a: Vector4<T>) -> T where T: Copy + Sqrt + Add<T, Output=T> + Mul<T, Output=T>Computes the length of vector.