feat(cpp-object-oriented-modular-refactoring): step 6 - io-application-google-style

include/fesa/app/fesa_application.h

@@ -0,0 +1,21 @@
+#ifndef FESA_APP_FESA_APPLICATION_H_
+#define FESA_APP_FESA_APPLICATION_H_
+
+#include <string>
+#include <vector>
+
+namespace fesa {
+
+/// @brief Owns the argv-independent CLI contract and stable process exit codes.
+class FesaApplication {
+ public:
+  /// @brief Runs one solver invocation from operands and options after argv[0].
+  /// @param arguments Input path and optional `--output` pair.
+  /// @return The stable CLI exit code for usage, input, model, solver, or
+  /// output status.
+  int Run(const std::vector<std::string>& arguments);
+};
+
+}  // namespace fesa
+
+#endif  // FESA_APP_FESA_APPLICATION_H_