1/*=============================================================================
2 Copyright (c) 2017 Paul Fultz II
3 always.cpp
4 Distributed under the Boost Software License, Version 1.0. (See accompanying
5 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6==============================================================================*/
7#include <boost/hof/always.hpp>
8#include <boost/hof/function.hpp>
9#include <memory>
10#include "test.hpp"
11
12BOOST_HOF_TEST_CASE()
13{
14 static const int ten = 10;
15 BOOST_HOF_STATIC_TEST_CHECK(boost::hof::always(ten)(1,2,3,4,5) == 10);
16 BOOST_HOF_TEST_CHECK( boost::hof::always(ten)(1,2,3,4,5) == 10 );
17
18 int i = 10;
19 BOOST_HOF_TEST_CHECK( boost::hof::always(std::ref(i))(1,2,3,4,5) == 10 );
20 BOOST_HOF_TEST_CHECK( &boost::hof::always(std::ref(i))(1,2,3,4,5) == &i );
21
22 boost::hof::always()(1, 2);
23 static_assert(std::is_same<decltype(boost::hof::always()(1, 2)), BOOST_HOF_ALWAYS_VOID_RETURN>::value, "Failed");
24}
25
26BOOST_HOF_TEST_CASE()
27{
28 int i = 10;
29 BOOST_HOF_TEST_CHECK( boost::hof::always_ref(i)(1,2,3,4,5) == 10 );
30 BOOST_HOF_TEST_CHECK( &boost::hof::always_ref(i)(1,2,3,4,5) == &i );
31}
32
33BOOST_HOF_STATIC_FUNCTION(gten) = boost::hof::always(std::integral_constant<int, 10>{});
34
35BOOST_HOF_TEST_CASE()
36{
37 BOOST_HOF_STATIC_TEST_CHECK(gten(1,2,3,4,5) == 10);
38 BOOST_HOF_TEST_CHECK(gten(1,2,3,4,5) == 10);
39}
40
41BOOST_HOF_TEST_CASE()
42{
43 auto f = boost::hof::always(10);
44 STATIC_ASSERT_NOT_DEFAULT_CONSTRUCTIBLE(decltype(f));
45 BOOST_HOF_TEST_CHECK(f(1,2,3,4,5) == 10);
46}
47
48struct copy_throws
49{
50 copy_throws() {}
51 copy_throws(copy_throws const&) {}
52 copy_throws(copy_throws&&) noexcept {}
53};
54
55BOOST_HOF_TEST_CASE()
56{
57 static_assert(noexcept(boost::hof::always()()), "noexcept always");
58 static_assert(noexcept(boost::hof::always(1)()), "noexcept always");
59 static_assert(!noexcept(boost::hof::always(copy_throws{})()), "noexcept always");
60 copy_throws ct{};
61 static_assert(!noexcept(boost::hof::always(ct)()), "noexcept always");
62 static_assert(noexcept(boost::hof::always(std::ref(t&: ct))()) == BOOST_HOF_IS_NOTHROW_COPY_CONSTRUCTIBLE(std::reference_wrapper<copy_throws>), "noexcept always");
63 auto ctf = boost::hof::always(copy_throws{});
64 static_assert(!noexcept(ctf()), "noexcept always");
65}
66

source code of boost/libs/hof/test/always.cpp