blob: 5ca6c57ea0f14da2495032155288b63c80a880cb (
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
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// -*- mode: C++ -*-
//
// Copyright 2021-2022 Google LLC
//
// Licensed under the Apache License v2.0 with LLVM Exceptions (the
// "License"); you may not use this file except in compliance with the
// License. You may obtain a copy of the License at
//
// https://llvm.org/LICENSE.txt
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Author: Giuliano Procida
#ifndef STG_ERROR_H_
#define STG_ERROR_H_
#include <exception>
#include <ios>
#include <iostream>
#include <optional>
#include <ostream>
#include <sstream>
#include <string>
namespace stg {
class Exception : public std::exception {
public:
explicit Exception(const std::string& message) {
Add(message);
}
const char* what() const noexcept(true) final {
return message_.c_str();
}
void Add(const std::string& message) {
(message_ += message) += '\n';
}
private:
std::string message_;
};
class Check {
public:
explicit Check(bool ok)
: os_(ok ? std::optional<std::ostringstream>()
: std::make_optional<std::ostringstream>()) {}
~Check() noexcept(false) {
if (os_) {
throw Exception(os_->str());
}
}
template <typename T>
Check& operator<<(const T& t) {
if (os_) {
*os_ << t;
}
return *this;
}
private:
std::optional<std::ostringstream> os_;
};
class Die {
public:
[[noreturn]] ~Die() noexcept(false) {
throw Exception(os_.str());
}
template <typename T>
Die& operator<<(const T& t) {
os_ << t;
return *this;
}
private:
std::ostringstream os_;
};
class Warn {
public:
~Warn() {
std::cerr << "warning: " << os_.str() << '\n';
}
template <typename T>
Warn& operator<<(const T& t) {
os_ << t;
return *this;
}
private:
std::ostringstream os_;
};
struct Error {
explicit Error(int number) : number(number) {}
int number;
};
inline std::ostream& operator<<(std::ostream& os, Error error) {
return os << std::system_error(error.number, std::generic_category()).what();
}
template <typename T>
struct Hex {
explicit Hex(const T& value) : value(value) {}
const T& value;
};
template <typename T> Hex(const T&) -> Hex<T>;
template <typename T>
std::ostream& operator<<(std::ostream& os, const Hex<T>& hex_value) {
// not quite right if an exception is thrown
const auto flags = os.flags();
os << std::hex << std::showbase << hex_value.value;
os.flags(flags);
return os;
}
} // namespace stg
#endif // STG_ERROR_H_
|
