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70 lines
2.0 KiB
Plaintext
70 lines
2.0 KiB
Plaintext
# This file is part of NIT ( http://www.nitlanguage.org ).
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#
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# Copyright 2012-2013 Alexis Laferrière <alexis.laf@xymus.net>
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# This module illustrates some uses of the FFI, specifically
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# how to use extern methods. Which means to implement a Nit method in C.
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module extern_methods
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redef enum Int
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# Returns self'th fibonnaci number
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# implemented here in C for optimization purposes
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fun fib : Int import fib `{
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if ( recv < 2 )
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return recv;
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else
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return Int_fib( recv-1 ) + Int_fib( recv-2 );
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`}
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# System call to sleep for "self" seconds
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fun sleep `{
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sleep( recv );
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`}
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# Return atan2l( self, x ) from libmath
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fun atan_with( x : Int ) : Float `{
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return atan2( recv, x );
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`}
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# This method callback to Nit methods from C code
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# It will use from C code:
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# * the local fib method
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# * the + operator, a method of Int
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# * to_s, a method of all objects
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# * String.to_cstring, a method of String to return an equivalent char*
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fun foo import fib, +, to_s, String.to_cstring `{
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long recv_fib = Int_fib( recv );
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long recv_plus_fib = Int__plus( recv, recv_fib );
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String nit_string = Int_to_s( recv_plus_fib );
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char *c_string = String_to_cstring( nit_string );
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printf( "from C: self + fib(self) = %s\n", c_string );
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`}
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# Equivalent to foo but written in pure Nit
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fun bar do print "from Nit: self + fib(self) = {self+self.fib}"
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end
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print 12.fib
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print "sleeping 1 second..."
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1.sleep
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print 100.atan_with( 200 )
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8.foo
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8.bar
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