/usr/include/dune/common/std/apply.hh is in libdune-common-dev 2.5.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_COMMON_STD_APPLY_HH
#define DUNE_COMMON_STD_APPLY_HH
#if __cpp_lib_apply
#include <tuple>
#elif __cpp_lib_experimental_apply
#include <experimental/tuple>
#else
#include <cstddef>
#include <utility>
#include <tuple>
#endif
namespace Dune
{
namespace Std
{
#if __cpp_lib_apply
using std::apply;
#elif __cpp_lib_experimental_apply
using std::experimental::apply;
#else
namespace Impl
{
template<class F, class ArgTuple, std::size_t... i>
decltype(auto) applyHelper(F&& f, ArgTuple&& args, std::index_sequence<i...>)
{
return f(std::get<i>(args)...);
}
} // namespace Impl
/**
* \brief Apply function with arguments given as tuple
*
* \param f A callable object
* \param args Tuple of arguments
*
* This will call the function with arguments generated by unpacking the tuple.
*/
template<class F, class ArgTuple>
decltype(auto) apply(F&& f, ArgTuple&& args)
{
auto indices = std::make_index_sequence<std::tuple_size<std::decay_t<ArgTuple>>::value>();
return Impl::applyHelper(std::forward<F>(f), std::forward<ArgTuple>(args), indices);
}
#endif
} // namespace Std
} // namespace Dune
#endif // #ifndef DUNE_COMMON_STD_APPLY_HH
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