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ConstexprAssert.hpp
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/*
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A compilation of the following posts:
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http://stackoverflow.com/questions/18648069/g-doesnt-compile-constexpr-function-with-assert-in-it
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http://ericniebler.com/2014/09/27/assert-and-constexpr-in-cxx11/
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This file is part of the Open Porous Media project (OPM).
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OPM is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OPM is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with OPM. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef OPM_CONSTEXPR_ASSERT_HPP
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#define OPM_CONSTEXPR_ASSERT_HPP
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#include <cassert>
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#include <utility>
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namespace
{
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template
<
class
Assert>
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void
constexpr_assert_failed(Assert&& a)
noexcept
{ std::forward<Assert>(a)(); }
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}
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// When evaluated at compile time emits a compilation error if condition is not true.
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// Invokes the standard assert at run time.
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#define constexpr_assert(cond) \
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((void)((cond) ? 0 : (constexpr_assert_failed([](){ assert(!#cond);}), 0)))
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#endif
opm
common
utility
ConstexprAssert.hpp
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