1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
|
require 'ffi'
describe "Callback" do
module LibC
extend FFI::Library
ffi_lib FFI::Platform::LIBC
callback :qsort_cmp, [ :pointer, :pointer ], :int
attach_function :qsort, [ :pointer, :int, :int, :qsort_cmp ], :int
end
it "arguments get passed correctly" do
p = MemoryPointer.new(:int, 2)
p.put_array_of_int32(0, [ 1 , 2 ])
args = []
cmp = proc do |p1, p2| args.push(p1.get_int(0)); args.push(p2.get_int(0)); 0; end
# this is a bit dodgey, as it relies on qsort passing the args in order
LibC.qsort(p, 2, 4, cmp)
# args.should == [ 1, 2 ]
end
it "Block can be substituted for Callback as last argument" do
p = MemoryPointer.new(:int, 2)
p.put_array_of_int32(0, [ 1 , 2 ])
args = []
# this is a bit dodgey, as it relies on qsort passing the args in order
LibC.qsort(p, 2, 4) do |p1, p2|
args.push(p1.get_int(0))
args.push(p2.get_int(0))
0
end
# args.should == [ 1, 2 ]
end
it "can be inlined" do
module LibC
extend FFI::Library
attach_function :qsort, [ :pointer, :int, :int, callback(:qsort_cmp, [ :pointer, :pointer ], :int) ], :int
end
end
it "can be anonymous" do
module LibC
extend FFI::Library
attach_function :qsort, [ :pointer, :int, :int, callback([ :pointer, :pointer ], :int) ], :int
end
end
end
|
