feat(cpp-object-oriented-modular-refactoring): step 5 - solver-workflow-google-style

include/fesa/assembly/parallel_for.h

@@ -0,0 +1,39 @@
+#ifndef FESA_ASSEMBLY_PARALLEL_FOR_H_
+#define FESA_ASSEMBLY_PARALLEL_FOR_H_
+
+#include <cstddef>
+#include <functional>
+
+namespace fesa {
+
+/// @brief Executes independent index-addressed work behind a backend boundary.
+/// @note Callers own output storage and each invocation may write only its
+/// index-owned slot.
+class ParallelFor {
+ public:
+  virtual ~ParallelFor() = default;
+
+  /// @brief Invokes body once for every index in [0, count).
+  virtual void Execute(std::size_t count,
+                       const std::function<void(std::size_t)>& body) const = 0;
+};
+
+/// @brief Executes index-addressed work serially.
+class SerialParallelFor final : public ParallelFor {
+ public:
+  /// @copydoc ParallelFor::Execute
+  void Execute(std::size_t count,
+               const std::function<void(std::size_t)>& body) const override;
+};
+
+/// @brief Executes index-addressed work through oneTBB.
+class TbbParallelFor final : public ParallelFor {
+ public:
+  /// @copydoc ParallelFor::Execute
+  void Execute(std::size_t count,
+               const std::function<void(std::size_t)>& body) const override;
+};
+
+}  // namespace fesa
+
+#endif  // FESA_ASSEMBLY_PARALLEL_FOR_H_