/usr/include/bobcat/fnwrap is in libbobcat-dev 3.19.01-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#define INCLUDED_BOBCAT_FNWRAP_
#include <tuple>
#include <bobcat/typetrait>
namespace FBB
{
class FnWrap
{
template <typename Function>
struct Dissect
{};
template <typename Ret, typename ...Args>
struct Dissect <Ret (*)(Args ...)>
{
typedef Ret ReturnType;
};
typedef Dissect<int> *NotUsed;
template <size_t count, typename Tuple>
struct At
{
typedef typename std::tuple_element<count - 1, Tuple>::type Type;
};
template <typename RetType, typename Func, typename Arg1, typename Arg2,
size_t size, typename Tuple, typename ... Args>
struct CallPack: public CallPack<RetType, Arg1, Arg2, Func, size - 1,
Tuple, typename At<size, Tuple>::Type, Args ...>
{
typedef typename TypeTrait<Arg1>::Plain first_argument_type;
typedef typename TypeTrait<Arg2>::Plain second_argument_type;
typedef typename At<size, Tuple>::Type LastType;
static RetType call(Func fun, Arg1 &&arg1, Arg2 &&arg2,
Tuple &tuple, Args &&...args);
};
// specialization: unary + ret. type
template <typename RetType, typename Func, typename Arg1,
typename Tuple, typename ... Args>
struct CallPack<RetType, Func, Arg1, NotUsed, 0, Tuple, Args...>
{
static RetType call(Func fun, Arg1 &&arg1, NotUsed &&arg2,
Tuple &tuple, Args &&...args);
};
// specialization: binary + ret. type
template <typename RetType, typename Func, typename Arg1, typename Arg2,
typename Tuple, typename ... Args>
struct CallPack<RetType, Func, Arg1, Arg2, 0, Tuple, Args...>
{
static RetType call(Func fun, Arg1 &&arg1, Arg2 &&arg2,
Tuple &tuple, Args &&...args);
};
// specialization: void unary
template <typename Func, typename Arg1, typename Tuple, typename ... Args>
struct CallPack<void, Func, Arg1, NotUsed, 0, Tuple, Args...>
{
static void call(Func fun, Arg1 &&arg1, NotUsed &&arg2,
Tuple &tuple, Args &&...args);
};
// specialization: void binary
template <typename Func, typename Arg1, typename Arg2, typename Tuple,
typename ... Args>
struct CallPack<void, Func, Arg1, Arg2, 0, Tuple, Args...>
{
static void call(Func fun, Arg1 &&arg1, Arg2 &&arg2,
Tuple &tuple, Args &&...args);
};
public:
template <typename Function, typename ... Args>
struct Functor
{
typedef typename Dissect<Function>::ReturnType RetType;
Function d_function;
std::tuple<Args ...> d_args;
Functor(Function fun, Args &&... args);
template <typename Arg1, typename Arg2>
typename Functor::RetType operator()(Arg1 &&arg1, Arg2 &&arg2);
template <typename Arg1>
typename Functor::RetType operator()(Arg1 &&arg1);
};
template <typename Function, typename ... Args>
static Functor<Function, Args...> unary(Function fun, Args &&...args);
template <typename Function, typename ... Args>
static Functor<Function, Args...> binary(Function fun, Args &&...args);
};
// Generic CallPack::call function, unpacking the tuple
template <typename RetType, typename Func, typename Arg1, typename Arg2,
size_t size, typename Tuple, typename ... Args>
RetType FnWrap::CallPack<RetType, Func, Arg1, Arg2, size, Tuple, Args...
>::call(Func fun, Arg1 &&arg1, Arg2 &&arg2, Tuple &tuple, Args &&...args)
{
return CallPack<RetType, Func, Arg1, Arg2, size - 1, Tuple,
LastType, Args ...
>::call(fun, std::forward<Arg1>(arg1), std::forward<Arg2>(arg2),
tuple, std::forward<LastType>(std::get<size - 1>(tuple)),
std::forward<Args>(args) ...
);
}
// Unary void CallPack::call function
template <typename Func, typename Arg1, typename Tuple, typename ... Args>
void FnWrap::CallPack<void, Func, Arg1, FnWrap::NotUsed, 0, Tuple,
Args...>::call( Func fun, Arg1 &&arg1, FnWrap::NotUsed &&arg2,
Tuple &tuple, Args &&...args)
{
fun(std::forward<Arg1>(arg1), std::forward<Args>(args)...);
}
// Unary non-void CallPack::call function
template <typename RetType, typename Func,
typename Arg1, typename Tuple, typename ... Args>
RetType FnWrap::CallPack<RetType, Func, Arg1, FnWrap::NotUsed, 0, Tuple,
Args...>::call( Func fun, Arg1 &&arg1, FnWrap::NotUsed &&arg2,
Tuple &tuple, Args &&...args)
{
return fun(std::forward<Arg1>(arg1), std::forward<Args>(args)...);
}
// Binary void CallPack::call function
template <typename Func, typename Arg1, typename Arg2, typename Tuple,
typename ... Args>
void FnWrap::CallPack<void, Func, Arg1, Arg2, 0, Tuple, Args...>::call(
Func fun, Arg1 &&arg1, Arg2 &&arg2, Tuple &tuple, Args &&...args)
{
fun(std::forward<Arg1>(arg1), std::forward<Arg2>(arg2),
std::forward<Args>(args)...);
}
// Binary non-void CallPack::call function
template <typename RetType, typename Func, typename Arg1, typename Arg2,
typename Tuple, typename ... Args>
RetType FnWrap::CallPack<RetType, Func, Arg1, Arg2, 0, Tuple, Args...>::call(
Func fun, Arg1 &&arg1, Arg2 &&arg2, Tuple &tuple, Args &&...args)
{
return fun(std::forward<Arg1>(arg1), std::forward<Arg1>(arg1),
std::forward<Args>(args)...);
}
// Functor's constructor
template <typename Function, typename ... Args>
FnWrap::Functor<Function, Args...>::Functor(Function fun, Args &&... args)
:
d_function(fun),
d_args(std::forward<Args>(args)...)
{}
template <typename Function, typename ... Args> // unary operator()
template <typename Arg1>
typename FnWrap::Functor<Function, Args...>::RetType FnWrap::Functor<
Function, Args...>::operator()(Arg1 &&arg1)
{
return CallPack<RetType, Function, Arg1, NotUsed, sizeof ... (Args),
std::tuple<Args ...>
>::call(d_function, std::forward<Arg1>(arg1), 0, d_args);
}
template <typename Function, typename ... Args> // binary operator()
template <typename Arg1, typename Arg2>
typename FnWrap::Functor<Function, Args...>::RetType FnWrap::Functor<
Function, Args...>::operator()(Arg1 &&arg1, Arg2 &&arg2)
{
return CallPack<RetType, Function, Arg1, Arg2, sizeof ... (Args),
std::tuple<Args ...>
>::call(d_function,
std::forward<Arg1>(arg1), std::forward<Arg2>(arg2), d_args);
}
template <typename Function, typename ... Args>
FnWrap::Functor<Function, Args...> context(Function fun, Args &&...args)
{
return FnWrap::Functor<Function, Args...>
(fun, std::forward<Args>(args) ...);
}
template <typename Function, typename ... Args>
FnWrap::Functor<Function, Args...> FnWrap::unary(Function fun, Args &&...args)
{
return Functor<Function, Args...>(fun, std::forward<Args>(args) ...);
}
template <typename Function, typename ... Args>
FnWrap::Functor<Function, Args...> FnWrap::binary(Function fun, Args &&...args)
{
return Functor<Function, Args...>(fun, std::forward<Args>(args) ...);
}
} // FBB
#endif
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