feat(linear-static-3d-euler-beam): step 13 - analysis-model

include/fesa/analysis/analysis_model.hpp

@@ -0,0 +1,34 @@
+#pragma once
+
+#include "fesa/model/domain.hpp"
+
+#include <vector>
+
+namespace fesa {
+
+// Provides the sole active-step view while the referenced Domain retains all
+// semantic ownership and must outlive this object.
+class AnalysisModel {
+public:
+    static Result<AnalysisModel> create(const Domain& domain);
+
+    const Domain& domain() const noexcept;
+    const StaticStepDefinition& step() const noexcept;
+    const std::vector<EntityIndex>& activeElements() const noexcept;
+    const std::vector<EntityIndex>& activeMaterials() const noexcept;
+    const std::vector<EntityIndex>& activeSections() const noexcept;
+    const std::vector<EntityIndex>& activeBoundaryConditions() const noexcept;
+    const std::vector<EntityIndex>& activeLoads() const noexcept;
+
+private:
+    explicit AnalysisModel(const Domain& domain);
+
+    const Domain* domain_;
+    std::vector<EntityIndex> activeElements_;
+    std::vector<EntityIndex> activeMaterials_;
+    std::vector<EntityIndex> activeSections_;
+    std::vector<EntityIndex> activeBoundaryConditions_;
+    std::vector<EntityIndex> activeLoads_;
+};
+
+} // namespace fesa