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      1 // Copyright 2013 The Go Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 // This file contains test cases for cgo with function pointer variables.
      6 
      7 package cgotest
      8 
      9 /*
     10 typedef int (*intFunc) ();
     11 
     12 int
     13 bridge_int_func(intFunc f)
     14 {
     15 	return f();
     16 }
     17 
     18 int fortytwo()
     19 {
     20 	return 42;
     21 }
     22 
     23 */
     24 import "C"
     25 import "testing"
     26 
     27 func callBridge(f C.intFunc) int {
     28 	return int(C.bridge_int_func(f))
     29 }
     30 
     31 func callCBridge(f C.intFunc) C.int {
     32 	return C.bridge_int_func(f)
     33 }
     34 
     35 func testFpVar(t *testing.T) {
     36 	const expected = 42
     37 	f := C.intFunc(C.fortytwo)
     38 	res1 := C.bridge_int_func(f)
     39 	if r1 := int(res1); r1 != expected {
     40 		t.Errorf("got %d, want %d", r1, expected)
     41 	}
     42 	res2 := callCBridge(f)
     43 	if r2 := int(res2); r2 != expected {
     44 		t.Errorf("got %d, want %d", r2, expected)
     45 	}
     46 	r3 := callBridge(f)
     47 	if r3 != expected {
     48 		t.Errorf("got %d, want %d", r3, expected)
     49 	}
     50 }
     51