egs_exact: do not construct the matrix more often than necessary

It does not change unless the diff coeffs change.

1 files changed, 3 insertions, 1 deletions

diff --git a/ell_grid_solve.h b/ell_grid_solve.h
index 182b087..0718b67 100644
--- a/ell_grid_solve.h
+++ b/ell_grid_solve.h
@@ -211,6 +211,8 @@ typedef struct EGSContext {
     int64_t time_total;
 } EGSContext;
 
+#define EGS_INIT_FLAG_SAME_DIFF_COEFFS (1 << 0)
+
 /**
  * Allocate the solver for the given domain size.
  *
@@ -229,7 +231,7 @@ EGSContext *mg2di_egs_alloc(enum EGSType solver_type, size_t domain_size[2]);
  *
  * @return 0 on success, a negative error code on failure.
  */
-int              mg2di_egs_init(EGSContext *ctx);
+int              mg2di_egs_init(EGSContext *ctx, int flags);
 /**
  * Free the solver and write NULL to the provided pointer.
  */