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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
#include <tuple>
#include <utility>
#include <sstream>
#include <dune/common/std/type_traits.hh>
struct A
{
typedef long type;
};
struct B
{
};
template <class Traits>
struct C
{
template <class T>
using Fallback = int;
template <class T>
using Target = typename T::type;
using type = Dune::detected_or_fallback_t<Fallback, Target, Traits>;
void foo() { };
};
int main()
{
C< A > ca;
ca.foo();
// this should produce a compiler warning
C< B > cb;
cb.foo();
}
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