blob: 95926f92fccb33e3f751e94fd9b2a9f5bd64a500 (
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
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
// Copyright (C) 2021 Joel Rosdahl and other contributors
//
// See doc/AUTHORS.adoc for a complete list of contributors.
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 3 of the License, or (at your option)
// any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
// more details.
//
// You should have received a copy of the GNU General Public License along with
// this program; if not, write to the Free Software Foundation, Inc., 51
// Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#pragma once
#include <utility>
namespace util {
// --- Interface ---
// Return value of `value` (where `T` typically is `nonstd::expected`) or throw
// an exception of type `E` with a `T::error_type` as the argument.
template<typename E, typename T>
typename T::value_type value_or_throw(const T& value);
template<typename E, typename T>
typename T::value_type value_or_throw(T&& value);
#define TRY(x_) \
do { \
const auto result = x_; \
if (!result) { \
return nonstd::make_unexpected(result.error()); \
} \
} while (false)
// --- Inline implementations ---
template<typename E, typename T>
inline typename T::value_type
value_or_throw(const T& value)
{
if (value) {
return *value;
} else {
throw E(value.error());
}
}
template<typename E, typename T>
inline typename T::value_type
value_or_throw(T&& value)
{
if (value) {
return std::move(*value);
} else {
throw E(value.error());
}
}
} // namespace util
|