81 lines
1.7 KiB
C++
81 lines
1.7 KiB
C++
#ifndef AOCPP_COORD_HPP_
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#define AOCPP_COORD_HPP_
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#include <functional>
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#include <map>
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#include <ostream>
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#include <tuple>
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namespace aocpp {
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/// Cartesian coordinate
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///
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/// Coordinate where y grows down and x grows right
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struct Coord {
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std::int64_t x, y;
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auto operator<=>(const Coord&) const = default;
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};
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auto Draw(std::ostream & out, std::map<Coord, std::int64_t> image) -> void;
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/// Move one unit up
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auto Up(Coord) -> Coord;
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/// Move one unit down
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auto Down(Coord) -> Coord;
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/// Move one unit left
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auto Left(Coord) -> Coord;
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/// Move one unit right
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auto Right(Coord) -> Coord;
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/// Mirror coordinates about y=x line
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auto Invert(Coord) -> Coord;
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/// Rotate clockwise
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auto CW(Coord) -> Coord;
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/// Rotate counter-clockwise
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auto CCW(Coord) -> Coord;
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auto Turn180(Coord) -> Coord;
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/// @brief Computes the "1 norm" of a coordinate as a vector
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/// @param vector
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/// @return Sum of magnitudes of components
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auto Norm1(Coord) -> std::int64_t;
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/// @brief Computes the "infinity norm" of a coordinate as a vector
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/// @param vector
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/// @return Magnitude of the largest component
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auto NormInf(Coord) -> std::int64_t;
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/// Add two coordinates pairwise
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auto operator+(Coord, Coord) -> Coord;
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/// Subtract two coordinates pairwise
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auto operator-(Coord, Coord) -> Coord;
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/// Compound assignment addition of coordinates
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auto operator+=(Coord &, Coord) -> Coord &;
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/// Compound assignment subtraction of coordinates
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auto operator-=(Coord &, Coord) -> Coord &;
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/// Write a coordinate to a string "(x,y)"
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auto operator<<(std::ostream &, Coord) -> std::ostream &;
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} // namespace
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template<>
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struct std::hash<aocpp::Coord>
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{
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auto operator()(aocpp::Coord const& c) const noexcept -> std::size_t {
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std::hash<std::int64_t> h;
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return h(c.x) ^ h(c.y);
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}
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};
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#endif
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