1 files changed, 33 insertions, 0 deletions
diff --git a/demo/gmp.py b/demo/gmp.py
new file mode 100644
index 0000000..44f233c
--- /dev/null
+++ b/demo/gmp.py
@@ -0,0 +1,33 @@
+import sys
+#
+# This is only a demo based on the GMP library.
+# There is a rather more complete (but perhaps outdated) version available at:
+# http://bazaar.launchpad.net/~tolot-solar-empire/+junk/gmpy_cffi/files
+#
+
+try:
+    from _gmp_cffi import ffi, lib
+except ImportError:
+    print 'run gmp_build first, then make sure the shared object is on sys.path'
+    sys.exit(1)
+
+# ffi "knows" about the declared variables and functions from the
+#     cdef parts of the module created from gmp_build
+# lib "knows" how to call the functions from the set_source parts
+#     of the module.
+
+# ____________________________________________________________
+
+a = ffi.new("mpz_t")
+b = ffi.new("mpz_t")
+
+if len(sys.argv) < 3:
+    print 'call as %s bigint1, bigint2' % sys.argv[0]
+    sys.exit(2)
+
+lib.mpz_init_set_str(a, sys.argv[1], 10)	# Assume decimal integers
+lib.mpz_init_set_str(b, sys.argv[2], 10)	# Assume decimal integers
+lib.mpz_add(a, a, b)			# a=a+b
+
+s = lib.mpz_get_str(ffi.NULL, 10, a)
+print ffi.string(s)