완성된 HHT trial의 constraint 자료 중복 평가 제거

src/fesa/elements/nonlinear_mitc4_configuration_internal.h

@@ -0,0 +1,24 @@
+#ifndef FESA_SRC_FESA_ELEMENTS_NONLINEAR_MITC4_CONFIGURATION_INTERNAL_H_
+#define FESA_SRC_FESA_ELEMENTS_NONLINEAR_MITC4_CONFIGURATION_INTERNAL_H_
+
+#include <array>
+#include <string>
+
+#include "fesa/elements/nonlinear_mitc4_shell.h"
+
+namespace fesa::nonlinear_mitc4_internal {
+
+/// @brief Owns reference values without depending on an analysis or identity
+/// key.
+struct ConfigurationSnapshot {
+  std::array<double, 64> values{};
+  SourceLocation source{};
+  std::string identity;
+
+  /// @brief Copies all immutable inputs of the internal equilibrium evaluator.
+  static ConfigurationSnapshot Read(const NonlinearMitc4Shell& element);
+};
+
+}  // namespace fesa::nonlinear_mitc4_internal
+
+#endif  // FESA_SRC_FESA_ELEMENTS_NONLINEAR_MITC4_CONFIGURATION_INTERNAL_H_