Length.hpp

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// Copyright © 2020-2024 Alexandre Coderre-Chabot
//
// This file is part of Physical Quantities (PhQ), a C++ library of physical quantities, physical
// models, and units of measure for scientific computing.
//
// Physical Quantities is hosted at:
//     https://github.com/acodcha/phq
//
// Physical Quantities is licensed under the MIT License:
//     https://mit-license.org
//
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// associated documentation files (the "Software"), to deal in the Software without restriction,
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#ifndef PHQ_DIMENSION_LENGTH_HPP
#define PHQ_DIMENSION_LENGTH_HPP
 
#include <cstddef>
#include <cstdint>
#include <functional>
#include <iostream>
#include <string>
#include <string_view>
 
namespace PhQ::Dimension {
 
/// \brief Base physical dimension of length. Typically denoted "L". One of seven independent base
/// physical dimensions that form the physical dimension set of any unit of measure or physical
/// quantity. Part of PhQ::Dimensions.
class Length {
public:
  /// \brief Default constructor. Constructs a base physical dimension of length with a value of
  /// zero.
  constexpr Length() = default;
 
  /// \brief Constructor. Constructs a base physical dimension of length with a given value.
  explicit constexpr Length(const int8_t value) : value(value) {}
 
  /// \brief Destructor. Destroys this base physical dimension of length.
  ~Length() noexcept = default;
 
  /// \brief Copy constructor. Constructs a base physical dimension of length by copying another
  /// one.
  constexpr Length(const Length& other) = default;
 
  /// \brief Copy assignment operator. Assigns the value of this base physical dimension of length
  /// by copying from another one.
  constexpr Length& operator=(const Length& other) = default;
 
  /// \brief Move constructor. Constructs a base physical dimension of length by moving another one.
  constexpr Length(Length&& other) noexcept = default;
 
  /// \brief Move assignment operator. Assigns the value of this base physical dimension of length
  /// by moving another one.
  constexpr Length& operator=(Length&& other) noexcept = default;
 
  /// \brief Value of this base physical dimension.
  [[nodiscard]] constexpr int8_t Value() const noexcept {
    return value;
  }
 
  /// \brief Abbreviation of this base physical dimension.
  static std::string_view Abbreviation() noexcept {
    return "L";
  }
 
  /// \brief Label of this base physical dimension.
  static std::string_view Label() noexcept {
    return "Length";
  }
 
  /// \brief Prints this base physical dimension as a string.
  [[nodiscard]] std::string Print() const noexcept {
    if (value == 0) {
      return {};
    }
    std::string string{Abbreviation()};
    if (value > 1) {
      string.append("^" + std::to_string(value));
    } else if (value < 0) {
      string.append("^(" + std::to_string(value) + ")");
    }
    return string;
  }
 
private:
  /// \brief Value of this base physical dimension.
  int8_t value{0};
};
 
inline constexpr bool operator==(const Length& left, const Length& right) noexcept {
  return left.Value() == right.Value();
}
 
inline constexpr bool operator!=(const Length& left, const Length& right) noexcept {
  return left.Value() != right.Value();
}
 
inline constexpr bool operator<(const Length& left, const Length& right) noexcept {
  return left.Value() < right.Value();
}
 
inline constexpr bool operator>(const Length& left, const Length& right) noexcept {
  return left.Value() > right.Value();
}
 
inline constexpr bool operator<=(const Length& left, const Length& right) noexcept {
  return left.Value() <= right.Value();
}
 
inline constexpr bool operator>=(const Length& left, const Length& right) noexcept {
  return left.Value() >= right.Value();
}
 
inline std::ostream& operator<<(std::ostream& stream, const Length& length) {
  stream << length.Print();
  return stream;
}
 
}  // namespace PhQ::Dimension
 
namespace std {
 
template <>
struct hash<PhQ::Dimension::Length> {
  inline size_t operator()(const PhQ::Dimension::Length& length) const {
    return hash<int8_t>()(length.Value());
  }
};
 
}  // namespace std
 
#endif  // PHQ_DIMENSION_LENGTH_HPP