all of the changes

include/FluidSim/PipeSolver.hpp

@@ -0,0 +1,20 @@
+#pragma once
+#include <stdexcept>
+#include <string_view>
+namespace fluidsim::port {
+enum class PipeSolver { Rusanov, Hlle, Hllc };
+inline const char* pipe_solver_name(PipeSolver solver) {
+    switch(solver) {
+    case PipeSolver::Rusanov: return "rusanov";
+    case PipeSolver::Hlle: return "hlle";
+    case PipeSolver::Hllc: return "hllc";
+    }
+    return "unknown";
+}
+inline PipeSolver parse_pipe_solver(std::string_view name) {
+    if(name=="rusanov") return PipeSolver::Rusanov;
+    if(name=="hlle") return PipeSolver::Hlle;
+    if(name=="hllc") return PipeSolver::Hllc;
+    throw std::invalid_argument("choose rusanov, hlle or hllc pipe solver");
+}
+} // namespace fluidsim::port