TypeDefs.h

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#pragma once
 
#include <string>
#include <optional>
#include <unordered_map>
 
namespace iguana {

  using vector_element_t = double;

  struct Momentum3 {
    vector_element_t px;
    vector_element_t py;
    vector_element_t pz;
  };
  struct Momentum3 {…};

  struct Momentum4 {
    vector_element_t px;
    vector_element_t py;
    vector_element_t pz;
    vector_element_t E;
  };
  struct Momentum4 {…};

  namespace particle {
    // clang-format off

    enum PDG {
      electron     = 11,
      photon       = 22,
      proton       = 2212,
      antiproton   = -2212,
      neutron      = 2112,
      antineutron  = -2112,
      pi_plus      = 211,
      pi_minus     = -211,
      kaon_plus    = 321,
      kaon_minus   = -321
    };
    enum PDG {…};

    const std::unordered_map<PDG, std::string> name{
      { electron, "electron" },
      { photon, "photon" },
      { proton, "proton" },
      { antiproton, "antiproton" },
      { neutron, "neutron" },
      { antineutron, "antineutron" },
      { pi_plus, "pi_plus" },
      { pi_minus, "pi_minus" },
      { kaon_plus, "kaon_plus" },
      { kaon_minus, "kaon_minus" }
    };
    const std::unordered_map<PDG, std::string> name {…};

    const std::unordered_map<PDG, std::string> title{
      { electron, "e^{-}" },
      { photon, "#gamma" },
      { proton, "p" },
      { antiproton, "#bar{p}" },
      { neutron, "n" },
      { antineutron, "#bar{n}" },
      { pi_plus, "#pi^{+}" },
      { pi_minus, "#pi^{-}" },
      { kaon_plus, "K^{+}" },
      { kaon_minus, "K^{-}" }
    };
    const std::unordered_map<PDG, std::string> title {…};

    const std::unordered_map<PDG, double> mass{
      { electron, 0.000511 },
      { photon, 0.0 },
      { proton, 0.938272 },
      { antiproton, 0.938272 },
      { neutron, 0.939565 },
      { antineutron, 0.939565 },
      { pi_plus, 0.139570 },
      { pi_minus, 0.139570 },
      { kaon_plus, 0.493677 },
      { kaon_minus, 0.493677 }
    };
    const std::unordered_map<PDG, double> mass {…};

    template <typename VALUE_TYPE>
    std::optional<VALUE_TYPE> const get(std::unordered_map<PDG,VALUE_TYPE> const& property, PDG const& pdg_code)
    {
      if(auto const& it = property.find(pdg_code); it != property.end())
        return it->second;
      return std::nullopt;
    }
    std::optional<VALUE_TYPE> const get(std::unordered_map<PDG,VALUE_TYPE> const& property, PDG const& pdg_code) {…}

    template <typename VALUE_TYPE>
    std::optional<VALUE_TYPE> const get(std::unordered_map<PDG,VALUE_TYPE> const& property, int const& pdg_code)
    {
      return get(property, static_cast<particle::PDG>(pdg_code));
    }
    std::optional<VALUE_TYPE> const get(std::unordered_map<PDG,VALUE_TYPE> const& property, int const& pdg_code) {…}
 
    // clang-format on
  }
  namespace particle {…}
 
}