operator_==.pass.cpp revision bc8d3f97eb5c958007f2713238472e0c1c8fe02c 
1//===----------------------------------------------------------------------===//
2//
3// ��������������������The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10// <functional>
11
12// class function<R(ArgTypes...)>
13
14// template <MoveConstructible R, MoveConstructible ... ArgTypes>
15//   bool operator==(const function<R(ArgTypes...)>&, nullptr_t);
16//
17// template <MoveConstructible R, MoveConstructible ... ArgTypes>
18//   bool operator==(nullptr_t, const function<R(ArgTypes...)>&);
19//
20// template <MoveConstructible R, MoveConstructible ... ArgTypes>
21//   bool operator!=(const function<R(ArgTypes...)>&, nullptr_t);
22//
23// template <MoveConstructible  R, MoveConstructible ... ArgTypes>
24//   bool operator!=(nullptr_t, const function<R(ArgTypes...)>&);
25
26#include <functional>
27#include <cassert>
28
29int g(int) {return 0;}
30
31int main()
32{
33    {
34    std::function<int(int)> f;
35    assert(f == nullptr);
36    assert(nullptr == f);
37    f = g;
38    assert(f != nullptr);
39    assert(nullptr != f);
40    }
41}
42