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// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
// SPDX-FileCopyrightInfo: Copyright © DUNE Project contributors, see file LICENSE.md in module root
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception
#ifndef DUNE_COMMON_STDTHREAD_HH
#define DUNE_COMMON_STDTHREAD_HH
namespace Dune
{
// used internally by assertCallOnce for the actual check
void doAssertCallOnce(const char *file, int line, const char *function);
//! \brief Make sure call_once() works and provide a helpful error message
//! otherwise.
/**
* For call_once() to work, certain versions of libstdc++ need to be
* _linked_ with -pthread or similar flags. If that is not the case,
* call_once() will throw an exception. This function checks that
* call_once() can indeed be used, i.e. that it does not throw an exception
* when it should not, and that the code does indeed get executed. If
* call_once() cannot be used, assertCallOnce() aborts the program with a
* helpful error message.
*
* The check is only actually executed the first time assertCallOnce() is
* called.
*
* The arguments \c file and \c line specify the filename and line number
* that should appear in the error message. They are ignored if \c file is
* 0. The argument \c function specifies the name of the function to appear
* in the error message. It is ignored if \c function is 0.
*/
inline void assertCallOnce(const char *file = nullptr, int line = -1,
const char *function = nullptr)
{
// make sure to call this only the first time this function is invoked
[[maybe_unused]] static const bool works
= (doAssertCallOnce(file, line, function), true);
}
//! \brief Make sure call_once() works and provide a helpful error message
//! otherwise.
/**
* This calls assertCallOnce() and automatically provides information about
* the caller in the error message.
*/
#define DUNE_ASSERT_CALL_ONCE() \
::Dune::assertCallOnce(__FILE__, __LINE__, __func__)
} // namespace Dune
#endif // DUNE_COMMON_STDTHREAD_HH
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