From 1cfb9752290197f8964a550db71403a715200544 Mon Sep 17 00:00:00 2001
From: "kr.angelov" <kr.angelov@gmail.com>
Date: Fri, 31 Oct 2014 19:57:56 +0000
Subject: [PATCH] a skeletal module for higher-order pattern unification in the
 C runtime

---
 src/runtime/c/Makefile.am |  3 ++-
 src/runtime/c/pgf/hopu.c  | 10 ++++++++++
 src/runtime/c/pgf/hopu.h  |  7 +++++++
 3 files changed, 19 insertions(+), 1 deletion(-)
 create mode 100644 src/runtime/c/pgf/hopu.c
 create mode 100644 src/runtime/c/pgf/hopu.h

diff --git a/src/runtime/c/Makefile.am b/src/runtime/c/Makefile.am
index 539a0e507..5fe493c65 100644
--- a/src/runtime/c/Makefile.am
+++ b/src/runtime/c/Makefile.am
@@ -76,10 +76,11 @@ libpgf_la_SOURCES = \
 	pgf/typechecker.c \
 	pgf/reasoner.c \
 	pgf/evaluator.c \
+	pgf/hopu.c \
 	pgf/printer.c \
 	pgf/graphviz.c \
 	pgf/pgf.c \
-	pgf/pgf.h
+	pgf/pgf.h \
 libpgf_la_LDFLAGS = "-no-undefined"
 libpgf_la_LIBADD = libgu.la
 
diff --git a/src/runtime/c/pgf/hopu.c b/src/runtime/c/pgf/hopu.c
new file mode 100644
index 000000000..5767feac0
--- /dev/null
+++ b/src/runtime/c/pgf/hopu.c
@@ -0,0 +1,10 @@
+#include "data.h"
+#include "evaluator.h"
+#include "hopu.h"
+
+void pgf_pattern_unify(PgfEvalState* state, PgfClosure* c1, PgfClosure* c2)
+{
+	c1 = state->eval_gates->enter(state, c1);
+	c2 = state->eval_gates->enter(state, c2);
+}
+
diff --git a/src/runtime/c/pgf/hopu.h b/src/runtime/c/pgf/hopu.h
new file mode 100644
index 000000000..e012a3630
--- /dev/null
+++ b/src/runtime/c/pgf/hopu.h
@@ -0,0 +1,7 @@
+#ifndef HOPU_H
+#define HOPU_H
+
+void pgf_pattern_unify(PgfEvalState* state, PgfClosure* c1, PgfClosure* c2);
+
+#endif
+