/usr/include/libfilezilla/apply.hpp is in libfilezilla-dev 0.11.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 | #ifndef LIBFILEZILLA_APPLY_HEADER
#define LIBFILEZILLA_APPLY_HEADER
#include <utility>
#include <tuple>
#include <type_traits>
/** \file
* \brief Template helper to call a function with its arguments extracted from a tuple.
*
* This helper is used for the event \ref fz::dispatch "dispatch"
*
* Similar to like std::experimental::apply
*/
namespace fz {
/** \private
* Apply tuple to ordinary functor
*/
template<typename F, typename Tuple, size_t... I>
auto apply_(F&& f, Tuple&& t, std::index_sequence<I...> const&) -> decltype(std::forward<F>(f)(std::get<I>(std::forward<Tuple>(t))...))
{
return std::forward<F>(f)(std::get<I>(std::forward<Tuple>(t))...);
}
/**
* \brief Apply tuple to ordinary functor
*
* Example:
*
* \code
*
* int f(int value, std::string const& str) { return value + str.size(); }
*
* auto t = std::make_tuple(5, std::string("Hello!"));
*
* int v = fz::apply(&f, t);
* // v is now 11
* \endcode
*/
template<typename F, typename Tuple, typename Seq = typename std::make_index_sequence<std::tuple_size<typename std::remove_reference<Tuple>::type>::value>>
auto apply(F && f, Tuple&& args) -> decltype(apply_(std::forward<F>(f), std::forward<Tuple>(args), Seq()))
{
return apply_(std::forward<F>(f), std::forward<Tuple>(args), Seq());
}
/** \private
* Apply tuple to pointer to member
*/
template<typename Obj, typename F, typename Tuple, size_t... I>
auto apply_(Obj&& obj, F&& f, Tuple&& t, std::index_sequence<I...> const&) -> decltype((std::forward<Obj>(obj)->*std::forward<F>(f))(std::get<I>(std::forward<Tuple>(t))...))
{
return (std::forward<Obj>(obj)->*std::forward<F>(f))(std::get<I>(std::forward<Tuple>(t))...);
}
/**
* \brief Apply tuple to pointer to member
*
* Example:
*
* \code
*
* struct object {
* int f(int value, std::string const& str) const { return value + str.size(); }
* };
*
*
* object o;
* auto t = std::make_tuple(5, std::string("Hello!"));
*
* int v = fz::apply(&o, &object::f, t);
* // v is now 11
* \endcode
*/
template<typename Obj, typename F, typename Tuple, typename Seq = typename std::make_index_sequence<std::tuple_size<typename std::remove_reference<Tuple>::type>::value>>
auto apply(Obj&& obj, F && f, Tuple&& args) -> decltype(apply_(std::forward<Obj>(obj), std::forward<F>(f), std::forward<Tuple>(args), Seq()))
{
return apply_(std::forward<Obj>(obj), std::forward<F>(f), std::forward<Tuple>(args), Seq());
}
}
#endif
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