* int_stack.nit: simple class for a stack of integers implemented with a linked list.
* clock_more.nit: refine clock to add comparability between clocks.
* circular_list.nit: simple use of generic classes and nullable types to implement a double-linked circular list.
+* extern_methods.nit: basic use of extern methods, Nit methods implemented in C code
--- /dev/null
+# This file is part of NIT ( http://www.nitlanguage.org ).
+#
+# Copyright 2012 Alexis Laferrière <alexis.laf@xymus.net>
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This module illustrates some uses of the native interface, specifically
+# how to use extern methods. Which means to implement a Nit method in C.
+#
+# Steps to use extern methods:
+# 1. Write the Nit module (like this file), define extern methods
+# with "is extern" and identify possible callbacks with "import".
+# 2. Run ithe "nits" program on the Nit module, it will generate
+# two files, extern_methods.stub.[ch] files.
+# 3. Modify those files to implement Nit methods in C.
+# 4. Rename the stub files to extern_methods.nit.c and extern_methods.nit.h.
+module extern_methods
+
+redef enum Int
+ # Returns self'th fibonnaci number
+ # implemented here in C for optimization purposes
+ fun fib : Int is extern
+
+ # System call to sleep for "self" seconds
+ fun sleep is extern
+
+ # Return atan2l( self, x ) from libmath
+ fun atan_with( x : Int ) : Float is extern
+
+ # This method callback to Nit methods from C code
+ # It will use from C code:
+ # * the local fib method
+ # * the + operator, a method of Int
+ # * to_s, a method of all objects
+ # * String::to_cstring, a method of String to return an equivalent char*
+ fun foo is extern import fib, +, to_s, String::to_cstring
+
+ # Equivalent to foo but written in pure Nit
+ fun bar do print "from Nit: self + fib(self) = {self+self.fib}"
+end
+
+print 12.fib
+
+print "sleeping 1 second..."
+1.sleep
+
+print 100.atan_with( 200 )
+8.foo
+8.bar
+
--- /dev/null
+/* This file is part of NIT ( http://www.nitlanguage.org ).
+ *
+ * Copyright 2012 Alexis Laferrière <alexis.laf@xymus.net>
+ *
+ * This file is free software, which comes along with NIT. This software is
+ * distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE. You can modify it is you want, provided this header
+ * is kept unaltered, and a notification of the changes is added.
+ * You are allowed to redistribute it and sell it, alone or is a part of
+ * another product.
+ */
+
+#include "extern_methods.nit.h"
+
+#include <math.h>
+
+/*
+C implementation of extern_methods::Int::fib
+*/
+bigint Int_fib___impl( bigint recv ) {
+ if ( recv < 2 )
+ return recv;
+ else
+ return Int_fib___impl( recv-1 ) + Int_fib___impl( recv-2 );
+}
+
+/*
+C implementation of extern_methods::Int::sleep
+*/
+void Int_sleep___impl( bigint recv ) {
+ sleep( recv );
+}
+
+/*
+C implementation of extern_methods::Int::atan_with
+*/
+float Int_atan_with___impl( bigint recv, bigint x ) {
+ return atan2( recv, x );
+}
+
+/*
+C implementation of extern_methods::Int::foo
+
+Imported methods signatures:
+ bigint Int_fib( bigint recv ) for extern_methods::Int::fib
+ bigint Int__plus( bigint recv, bigint i ) for kernel::Int::(kernel::Discrete::+)
+ String Int_to_s( bigint recv ) for string::Int::(string::Object::to_s)
+ char * String_to_cstring( String recv ) for string::String::to_cstring
+*/
+void Int_foo___impl( bigint recv ) {
+ bigint recv_fib = Int_fib( recv );
+ bigint recv_plus_fib = Int__plus( recv, recv_fib );
+
+ String nit_string = Int_to_s( recv_plus_fib );
+ char *c_string = String_to_cstring( nit_string );
+
+ printf( "from C: self + fib(self) = %s\n", c_string );
+}
+
--- /dev/null
+/* This file is part of NIT ( http://www.nitlanguage.org ).
+ *
+ * Copyright 2012 Alexis Laferrière <alexis.laf@xymus.net>
+ *
+ * This file is free software, which comes along with NIT. This software is
+ * distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
+ * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE. You can modify it is you want, provided this header
+ * is kept unaltered, and a notification of the changes is added.
+ * You are allowed to redistribute it and sell it, alone or is a part of
+ * another product.
+ */
+
+#ifndef EXTERN_METHODS_NIT_H
+#define EXTERN_METHODS_NIT_H
+
+#include <extern_methods._nitni.h>
+
+bigint Int_fib___impl( bigint recv );
+void Int_sleep___impl( bigint recv );
+float Int_atan_with___impl( bigint recv, bigint x );
+void Int_foo___impl( bigint recv );
+
+#endif
--- /dev/null
+144
+sleeping 1 second...
+0.463647
+from C: self + fib(self) = 29
+from Nit: self + fib(self) = 29
nitlanguage / nit.git / commitdiff