blob: 6e85c2045db088bf659213d4c206884fe82505bd (
plain)
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
|
// Copyright Louis Dionne 2013-2017
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
#include <boost/hana/optional.hpp>
#include <boost/hana/type.hpp>
#include <type_traits>
namespace hana = boost::hana;
// This test makes sure that an optional holding a hana::type has a
// nested ::type alias.
template <typename ...>
using void_t = void;
template <typename T, typename = void>
struct has_type : std::false_type { };
template <typename T>
struct has_type<T, void_t<typename T::type>>
: std::true_type
{ };
struct T;
static_assert(std::is_same<decltype(hana::just(hana::type_c<T>))::type, T>{}, "");
static_assert(!has_type<decltype(hana::nothing)>{}, "");
int main() { }
|
