Advance the solution by one time step using the explicit Euler scheme.
First-order, one-stage method. Stage arithmetic lives in stepper_kernels::kernel_euler; this adapter only remaps the 1D state's flat pointers and supplies the rhs callback. No scratch arrays required. Also computes the global L2 residual norm for convergence monitoring.
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| type(solver_state_t), | intent(inout), | target | :: | state |