fix: remove narrowing conversion from std::size_t to int

Core/src/Detector/detail/IndexedGridFiller.cpp

@@ -47,39 +47,31 @@ std::vector<std::size_t> Acts::Experimental::detail::binSequence(
     rBins.reserve(bmax - bmin + 1u + 2 * expand);
     // handle bmin:/max expand it down (for bound, don't fill underflow)
     if (type == Acts::AxisBoundaryType::Bound) {
-      bmin = (static_cast<int>(bmin) - static_cast<int>(expand) > 0)
-                 ? bmin - expand
-                 : 1u;
+      bmin = bmin > expand ? bmin - expand : 1u;
       bmax = (bmax + expand <= nBins) ? bmax + expand : nBins;
     } else if (type == Acts::AxisBoundaryType::Open) {
-      bmin = (static_cast<int>(bmin) - static_cast<int>(expand) >= 0)
-                 ? bmin - expand
-                 : 0u;
+      bmin = bmin >= expand ? bmin - expand : 0u;
       bmax = (bmax + expand <= nBins + 1u) ? bmax + expand : nBins + 1u;
     }
     fill_linear(bmin, bmax);
   } else {
     // Close case
     std::size_t span = bmax - bmin + 1u + 2 * expand;
     // Safe with respect to the closure point, treat as bound
-    if (2 * span < nBins && (bmax + expand <= nBins) &&
-        (static_cast<int>(bmin) - static_cast<int>(expand) > 0)) {
+    if (2 * span < nBins && (bmax + expand <= nBins) && (bmin > expand)) {
       return binSequence({bmin, bmax}, expand, nBins,
                          Acts::AxisBoundaryType::Bound);
     } else if (2 * span < nBins) {
-      bmin = static_cast<int>(bmin) - static_cast<int>(expand) > 0
-                 ? bmin - expand
-                 : 1u;
+      bmin = bmin > expand ? bmin - expand : 1u;
       bmax = bmax + expand <= nBins ? bmax + expand : nBins;
       fill_linear(bmin, bmax);
       // deal with expansions over the phi boundary
       if (bmax + expand > nBins) {
         std::size_t overstep = (bmax + expand - nBins);
         fill_linear(1u, overstep);
       }
-      if (static_cast<int>(bmin) - static_cast<int>(expand) < 1) {
-        std::size_t understep =
-            abs(static_cast<int>(bmin) - static_cast<int>(expand));
+      if (bmin <= expand) {
+        std::size_t understep = expand - bmin;
         fill_linear(nBins - understep, nBins);
       }
       std::ranges::sort(rBins);

Examples/Algorithms/Digitization/include/ActsExamples/Digitization/DigitizationAlgorithm.hpp

@@ -122,7 +122,7 @@ class DigitizationAlgorithm final : public IAlgorithm {
   Config m_cfg;
   /// Digitizers within geometry hierarchy
   Acts::GeometryHierarchyMap<Digitizer> m_digitizers;
-  /// Geometric digtizer
+  /// Geometric digitizer
   ActsFatras::Channelizer m_channelizer;
 
   using CellsMap =
@@ -153,7 +153,7 @@ class DigitizationAlgorithm final : public IAlgorithm {
     // Copy the geometric configuration
     impl.geometric = cfg.geometricDigiConfig;
     // Prepare the smearing configuration
-    for (int i = 0; i < static_cast<int>(kSmearDIM); ++i) {
+    for (std::size_t i = 0; i < kSmearDIM; ++i) {
       impl.smearing.indices[i] = cfg.smearingDigiConfig.at(i).index;
       impl.smearing.smearFunctions[i] =
           cfg.smearingDigiConfig.at(i).smearFunction;

Examples/Algorithms/TrackFitting/src/RefittingAlgorithm.cpp

@@ -64,7 +64,8 @@ ActsExamples::ProcessCode ActsExamples::RefittingAlgorithm::execute(
   auto itrack = 0ul;
   for (const auto& track : inputTracks) {
     // Check if you are not in picking mode
-    if (m_cfg.pickTrack > -1 && m_cfg.pickTrack != static_cast<int>(itrack++)) {
+    if (m_cfg.pickTrack > -1 &&
+        static_cast<std::size_t>(m_cfg.pickTrack) != itrack++) {
       continue;
     }
 

Examples/Algorithms/TrackFitting/src/TrackFittingAlgorithm.cpp

@@ -103,7 +103,8 @@ ActsExamples::ProcessCode ActsExamples::TrackFittingAlgorithm::execute(
   std::vector<Acts::SourceLink> trackSourceLinks;
   for (std::size_t itrack = 0; itrack < protoTracks.size(); ++itrack) {
     // Check if you are not in picking mode
-    if (m_cfg.pickTrack > -1 && m_cfg.pickTrack != static_cast<int>(itrack)) {
+    if (m_cfg.pickTrack > -1 &&
+        static_cast<std::size_t>(m_cfg.pickTrack) != itrack) {
       continue;
     }
 

Fatras/include/ActsFatras/Digitization/UncorrelatedHitSmearer.hpp

@@ -86,7 +86,7 @@ struct BoundParametersSmearer {
 
     ParametersVector par = ParametersVector::Zero();
     CovarianceMatrix cov = CovarianceMatrix::Zero();
-    for (int i = 0; i < static_cast<int>(kSize); ++i) {
+    for (std::size_t i = 0; i < kSize; ++i) {
       auto res = smearFunctions[i](boundParams[indices[i]], rng);
       if (!res.ok()) {
         return Result::failure(res.error());