libcruft-util/posix/except.hpp

69 lines
1.8 KiB
C++

/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* 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.
*
* Copyright 2010, 2017,
* Danny Robson <danny@nerdcruft.net>
*/
#ifndef CRUFT_UTIL_POSIX_EXCEPT_HPP
#define CRUFT_UTIL_POSIX_EXCEPT_HPP
#include <stdexcept>
namespace util::posix {
/// An exception class used for reporting errors signalled by errno.
///
/// Ideally this would be named `errno' but that symbol is permitted to
/// be a macro and significantly complicates symbol resolution either way.
class error : public std::runtime_error {
public:
explicit error (int code);
error ();
int code (void) const;
static int last_code (void);
static void try_code (void);
static void try_code (int code);
static void throw_code [[gnu::noreturn]] (void);
static void throw_code [[gnu::noreturn]] (int code);
template <typename T>
static T try_value (T value)
{
if (value < 0)
throw_code ();
return value;
}
private:
int m_code;
};
class eai : public std::runtime_error {
public:
explicit eai (int code);
int code (void) const;
static void try_code (int);
static void throw_code [[gnu::noreturn]] (int);
private:
int m_code;
};
};
#endif