libgo/misc/cgo/test/fpvar.go

   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 }