/usr/include/range/v3/utility/invoke.hpp is in librange-v3-dev 0.3.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Range v3 library
//
// Copyright Eric Niebler 2013-present
// Copyright Casey Carter 2016
//
// Use, modification and distribution is subject to the
// Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// Project home: https://github.com/ericniebler/range-v3
//
#ifndef RANGES_V3_UTILITY_INVOKE_HPP
#define RANGES_V3_UTILITY_INVOKE_HPP
#include <functional>
#include <memory>
#include <type_traits>
#include <utility>
#include <meta/meta.hpp>
#include <range/v3/detail/config.hpp>
#include <range/v3/utility/concepts.hpp>
#include <range/v3/utility/static_const.hpp>
RANGES_DIAGNOSTIC_PUSH
RANGES_DIAGNOSTIC_IGNORE_PRAGMAS
RANGES_DIAGNOSTIC_IGNORE_CXX17_COMPAT
namespace ranges
{
inline namespace v3
{
/// \addtogroup group-utility
/// @{
template<typename T>
struct is_reference_wrapper
: meta::if_<
std::is_same<uncvref_t<T>, T>,
std::false_type,
is_reference_wrapper<uncvref_t<T>>>
{};
template<typename T>
struct is_reference_wrapper<reference_wrapper<T>>
: std::true_type
{};
template<typename T>
struct is_reference_wrapper<std::reference_wrapper<T>>
: std::true_type
{};
template<typename T>
using is_reference_wrapper_t = meta::_t<is_reference_wrapper<T>>;
struct invoke_fn
{
private:
template<typename MemberFunctionPtr, typename First, typename... Rest>
static constexpr auto invoke_member_fn(
std::true_type, detail::any, MemberFunctionPtr fn, First && first, Rest &&... rest)
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
(static_cast<First&&>(first).*fn)(static_cast<Rest&&>(rest)...)
)
template<typename MemberFunctionPtr, typename First, typename... Rest>
static constexpr auto invoke_member_fn(
std::false_type, std::true_type, MemberFunctionPtr fn, First && first, Rest &&... rest)
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
(static_cast<First&&>(first).get().*fn)(static_cast<Rest&&>(rest)...)
)
template<typename MemberFunctionPtr, typename First, typename... Rest>
static constexpr auto invoke_member_fn(
std::false_type, std::false_type, MemberFunctionPtr fn, First && first, Rest &&... rest)
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
((*static_cast<First&&>(first)).*fn)(static_cast<Rest&&>(rest)...)
)
template<typename MemberDataPtr, typename First>
static constexpr auto invoke_member_data(
std::true_type, detail::any, MemberDataPtr ptr, First && first)
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
static_cast<First&&>(first).*ptr
)
template<typename MemberDataPtr, typename First>
static constexpr auto invoke_member_data(
std::false_type, std::true_type, MemberDataPtr ptr, First && first)
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
static_cast<First&&>(first).get().*ptr
)
template<typename MemberDataPtr, typename First>
static constexpr auto invoke_member_data(
std::false_type, std::false_type, MemberDataPtr ptr, First && first)
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
(*static_cast<First&&>(first)).*ptr
)
public:
template<typename F, typename Obj, typename First, typename... Rest,
meta::if_c<detail::is_function<F>::value, int> = 0>
constexpr auto operator()(F Obj::*ptr, First && first, Rest &&... rest) const
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
invoke_member_fn(std::is_base_of<Obj, detail::decay_t<First>>{},
is_reference_wrapper_t<detail::decay_t<First>>{},
ptr, static_cast<First&&>(first), static_cast<Rest&&>(rest)...)
)
template<typename Data, typename Obj, typename First,
meta::if_c<!detail::is_function<Data>::value, int> = 0>
constexpr auto operator()(Data Obj::*ptr, First && first) const
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
invoke_member_data(std::is_base_of<Obj, detail::decay_t<First>>{},
is_reference_wrapper_t<detail::decay_t<First>>{},
ptr, static_cast<First&&>(first))
)
template<typename F, typename... Args,
meta::if_c<!std::is_member_pointer<uncvref_t<F>>::value, int> = 0>
constexpr auto operator()(F && fn, Args &&... args) const
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
static_cast<F&&>(fn)(static_cast<Args&&>(args)...)
)
};
RANGES_INLINE_VARIABLE(invoke_fn, invoke)
/// \cond
namespace detail
{
template<typename T>
struct reference_wrapper_
{
T *t_ = nullptr;
constexpr reference_wrapper_() = default;
constexpr reference_wrapper_(T &t) noexcept
: t_(std::addressof(t))
{}
constexpr reference_wrapper_(T &&) = delete;
constexpr T &get() const noexcept
{
return *t_;
}
};
template<typename T>
struct reference_wrapper_<T &> : reference_wrapper_<T>
{
using reference_wrapper_<T>::reference_wrapper_;
};
template<typename T>
struct reference_wrapper_<T &&>
{
T *t_ = nullptr;
constexpr reference_wrapper_() = default;
constexpr reference_wrapper_(T &&t) noexcept
: t_(std::addressof(t))
{}
constexpr T &&get() const noexcept
{
return static_cast<T &&>(*t_);
}
};
}
/// \endcond
// Can be used to store rvalue references in addition to lvalue references.
// Also, see: https://cplusplus.github.io/LWG/lwg-active.html#2993
template<typename T>
struct reference_wrapper : private detail::reference_wrapper_<T>
{
private:
using base_ = detail::reference_wrapper_<T>;
public:
using type = meta::_t<std::remove_reference<T>>;
using reference = meta::if_<std::is_reference<T>, T, T &>;
constexpr reference_wrapper() = default;
template<typename U,
CONCEPT_REQUIRES_(Constructible<base_, U>() &&
!Same<uncvref_t<U>, reference_wrapper>())>
constexpr reference_wrapper(U &&u)
noexcept(std::is_nothrow_constructible<base_, U>::value)
: detail::reference_wrapper_<T>{static_cast<U &&>(u)}
{}
constexpr reference get() const noexcept
{
return this->base_::get();
}
constexpr operator reference() const noexcept
{
return get();
}
CONCEPT_REQUIRES(!std::is_rvalue_reference<T>::value)
operator std::reference_wrapper<type> () const noexcept
{
return {get()};
}
template<typename ...Args>
constexpr auto operator()(Args &&...args) const
RANGES_DECLTYPE_NOEXCEPT(
invoke(std::declval<reference>(), std::declval<Args>()...))
{
return invoke(get(), static_cast<Args&&>(args)...);
}
};
template<typename Sig, typename Enable /*= void*/>
struct result_of {};
template<typename Fun, typename...Args>
struct result_of<Fun(Args...), meta::void_<
decltype(invoke(std::declval<Fun>(), std::declval<Args>()...))>>
{
using type = decltype(invoke(std::declval<Fun>(), std::declval<Args>()...));
};
} // namespace v3
} // namespace ranges
RANGES_DIAGNOSTIC_POP
#endif // RANGES_V3_UTILITY_INVOKE_HPP
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