56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
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/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2010, 2017,
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* Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef CRUFT_UTIL_POSIX_EXCEPT_HPP
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#define CRUFT_UTIL_POSIX_EXCEPT_HPP
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#include <stdexcept>
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namespace util::posix {
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/// An exception class used for reporting errors signalled by errno.
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///
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/// Ideally this would be named `errno' but that symbol is permitted to
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/// be a macro and significantly complicates symbol resolution either way.
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class error : public std::runtime_error {
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public:
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explicit error (int code);
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error ();
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int code (void) const;
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static int last_code (void);
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static void try_code (void);
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static void try_code (int code);
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static void throw_code [[gnu::noreturn]] (void);
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static void throw_code [[gnu::noreturn]] (int code);
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template <typename T>
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static T try_value (T value)
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{
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if (value < 0)
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throw_code ();
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return value;
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}
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private:
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int m_code;
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};
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}
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#endif
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