chore: Update particle data script (#4081)

- Encode the `particle` package version used to run (also you can run this with `uv run` now)
- Make the output use `std::type_t` as per our guidelines
- Make the output use `std::array` over C-style arrays

Core/src/Definitions/ParticleDataTable.hpp

@@ -12,6 +12,7 @@
 
 #pragma once
 
+#include <array>
 #include <cstdint>
 #include <limits>
 
@@ -21,7 +22,7 @@
 // within all column arrays.
 
 static constexpr std::uint32_t kParticlesCount = 6502u;
-static const std::int32_t kParticlesPdgNumber[kParticlesCount] = {
+static const std::array<std::int32_t, kParticlesCount> kParticlesPdgNumber = {
     // Og294~
     -1001182940,
     // Ts294~
@@ -13027,7 +13028,7 @@ static const std::int32_t kParticlesPdgNumber[kParticlesCount] = {
     // Og294
     1001182940,
 };
-static const std::int16_t kParticlesThreeCharge[kParticlesCount] = {
+static const std::array<std::int16_t, kParticlesCount> kParticlesThreeCharge = {
     // Og294~
     -354,
     // Ts294~
@@ -26033,7 +26034,7 @@ static const std::int16_t kParticlesThreeCharge[kParticlesCount] = {
     // Og294
     354,
 };
-static const float kParticlesMassMeV[kParticlesCount] = {
+static const std::array<float, kParticlesCount> kParticlesMassMeV = {
     // Og294~
     0.0f,
     // Ts294~
@@ -39039,7 +39040,7 @@ static const float kParticlesMassMeV[kParticlesCount] = {
     // Og294
     0.0f,
 };
-static const char* const kParticlesName[kParticlesCount] = {
+static const std::array<const char* const, kParticlesCount> kParticlesName = {
     "Og294~",
     "Ts294~",
     "Lv293~",

Fatras/scripts/generate_particle_data_table.py

@@ -1,4 +1,11 @@
 #!/usr/bin/env python3
+
+# /// script
+# dependencies = [
+#   "particle==0.24.0",
+# ]
+# ///
+
 #
 # use scikit-hep/particle to generate c++ code for the particle data table.
 #
@@ -40,6 +47,7 @@ def main(output_file):
 #pragma once
 
 #include <cstdint>
+#include <array>
 #include <limits>
 
 // Rows within the particle data table are sorted by their signed PDG particle
@@ -59,10 +67,10 @@ def generate_code(table):
     num_rows = len(table)
     # name, c++ type, and output format for each column
     columns = [
-        ("PdgNumber", "int32_t", "{}"),
-        ("ThreeCharge", "int16_t", "{}"),
+        ("PdgNumber", "std::int32_t", "{}"),
+        ("ThreeCharge", "std::int16_t", "{}"),
         ("MassMeV", "float", "{}f"),
-        ("Name", "char* const   ", '"{}"'),
+        ("Name", " const  char* const", '"{}"'),
     ]
     lines = [
         CODE_HEADER,
@@ -71,7 +79,7 @@ def generate_code(table):
     # build a separate array for each column
     for i, (variable_name, type_name, value_format) in enumerate(columns):
         lines.append(
-            f"static const {type_name} kParticles{variable_name}[kParticlesCount] = {{"
+            f"static const std::array<{type_name}, kParticlesCount> kParticles{variable_name} = {{"
         )
 
         for row in table: