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46 v2(
const double&
x,
const double&
y);
55 const double&
x()
const;
59 const double&
y()
const;
65 const double&
operator[](
const size_t& k)
const;
69 const double&
operator()(
const size_t& k)
const;
84 double dot(
const v2& p)
const;
144 void scale(
const double& sx,
const double& sy);
198 std::ostream&
operator<<(std::ostream& stream,
const v2& p);