Port FluidSim core and scenarios to C++20

src/solver.cpp

@@ -0,0 +1,27 @@
+#include "FluidSim/Solver.hpp"
+
+#include <algorithm>
+
+namespace fluidsim::port {
+
+Solver::Solver(std::vector<Pipe1D>& pipes, BoundarySystem& boundaries)
+    : pipes_(pipes), boundaries_(boundaries) {}
+
+void Solver::add_component(Component& component) {
+    components_.push_back(&component);
+}
+
+void Solver::step(float dt) {
+    if (dt <= 0.0f) return;
+    int substeps = std::max(minimum_substeps, 1);
+    for (const auto& pipe : pipes_) substeps = std::max(substeps, pipe.required_substeps(dt, 0.8f));
+    const float sub_dt = dt / static_cast<float>(substeps);
+    for (int i = 0; i < substeps; ++i) {
+        boundaries_.resolve(sub_dt);
+        for (auto& pipe : pipes_) pipe.advance(sub_dt);
+    }
+    for (Component* component : components_) component->update_state(dt);
+    ++step_count_;
+}
+
+} // namespace fluidsim::port