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b77224b68f
Summary: Simplifies the C++11-style "-> decltype(...)" return-type deduction. Note that you have to be careful about whether the function return type is `auto` or `decltype(auto)`. The difference is that bare `auto` strips const and reference, just like lambda return type deduction. In some cases that's what we want (or more likely, we know that the return type is a value type), but whenever we're wrapping a templated function which might return a reference, we need to be sure that the return type is decltype(auto). No functional change. Subscribers: dexonsmith, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D74383
47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
//===- llvm/Support/Errno.h - Portable+convenient errno handling -*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file declares some portable and convenient functions to deal with errno.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_ERRNO_H
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#define LLVM_SUPPORT_ERRNO_H
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#include <cerrno>
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#include <string>
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#include <type_traits>
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namespace llvm {
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namespace sys {
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/// Returns a string representation of the errno value, using whatever
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/// thread-safe variant of strerror() is available. Be sure to call this
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/// immediately after the function that set errno, or errno may have been
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/// overwritten by an intervening call.
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std::string StrError();
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/// Like the no-argument version above, but uses \p errnum instead of errno.
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std::string StrError(int errnum);
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template <typename FailT, typename Fun, typename... Args>
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inline decltype(auto) RetryAfterSignal(const FailT &Fail, const Fun &F,
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const Args &... As) {
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decltype(F(As...)) Res;
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do {
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errno = 0;
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Res = F(As...);
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} while (Res == Fail && errno == EINTR);
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return Res;
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}
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} // namespace sys
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} // namespace llvm
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#endif // LLVM_SYSTEM_ERRNO_H
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