X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=src%2Fmath%2Finteraction.h;h=66025b6628f428d012ff879268f00367e3a26a1f;hb=32b22a683b99b2675a208b43937fed8463583c1a;hp=73b440be32b014cc4da06c715266efb1b4e6da18;hpb=9e0e4996fad6563f0a1ce628b80db5c23ef8279e;p=pspp

diff --git a/src/math/interaction.h b/src/math/interaction.h
index 73b440be32..66025b6628 100644
--- a/src/math/interaction.h
+++ b/src/math/interaction.h
@@ -27,7 +27,7 @@ struct interaction_value * interaction_value_create (const struct interaction_va
 void interaction_value_destroy (struct interaction_value *);
 size_t interaction_variable_get_n_vars (const struct interaction_variable *);
 double interaction_value_get_nonzero_entry (const struct interaction_value *);
-union value * interaction_value_get (const struct interaction_value *);
+const union value *interaction_value_get (const struct interaction_value *);
 const struct variable * interaction_variable_get_var (const struct interaction_variable *);
 size_t interaction_get_n_numeric (const struct interaction_variable *);
 size_t interaction_get_n_alpha (const struct interaction_variable *);