This file is indexed.

/usr/include/asio/impl/use_future.hpp is in libasio-dev 1:1.10.8-1.

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
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
//
// impl/use_future.hpp
// ~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under 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)
//

#ifndef ASIO_IMPL_USE_FUTURE_HPP
#define ASIO_IMPL_USE_FUTURE_HPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)

#include "asio/detail/config.hpp"
#include <future>
#include "asio/async_result.hpp"
#include "asio/error_code.hpp"
#include "asio/handler_type.hpp"
#include "asio/system_error.hpp"

#include "asio/detail/push_options.hpp"

namespace asio {
namespace detail {

  // Completion handler to adapt a promise as a completion handler.
  template <typename T>
  class promise_handler
  {
  public:
    // Construct from use_future special value.
    template <typename Alloc>
    promise_handler(use_future_t<Alloc> uf)
      : promise_(std::allocate_shared<std::promise<T> >(
            typename Alloc::template rebind<char>::other(uf.get_allocator()),
            std::allocator_arg,
            typename Alloc::template rebind<char>::other(uf.get_allocator())))
    {
    }

    void operator()(T t)
    {
      promise_->set_value(t);
    }

    void operator()(const asio::error_code& ec, T t)
    {
      if (ec)
        promise_->set_exception(
            std::make_exception_ptr(
              asio::system_error(ec)));
      else
        promise_->set_value(t);
    }

  //private:
    std::shared_ptr<std::promise<T> > promise_;
  };

  // Completion handler to adapt a void promise as a completion handler.
  template <>
  class promise_handler<void>
  {
  public:
    // Construct from use_future special value. Used during rebinding.
    template <typename Alloc>
    promise_handler(use_future_t<Alloc> uf)
      : promise_(std::allocate_shared<std::promise<void> >(
            typename Alloc::template rebind<char>::other(uf.get_allocator()),
            std::allocator_arg,
            typename Alloc::template rebind<char>::other(uf.get_allocator())))
    {
    }

    void operator()()
    {
      promise_->set_value();
    }

    void operator()(const asio::error_code& ec)
    {
      if (ec)
        promise_->set_exception(
            std::make_exception_ptr(
              asio::system_error(ec)));
      else
        promise_->set_value();
    }

  //private:
    std::shared_ptr<std::promise<void> > promise_;
  };

  // Ensure any exceptions thrown from the handler are propagated back to the
  // caller via the future.
  template <typename Function, typename T>
  void asio_handler_invoke(Function f, promise_handler<T>* h)
  {
    std::shared_ptr<std::promise<T> > p(h->promise_);
    try
    {
      f();
    }
    catch (...)
    {
      p->set_exception(std::current_exception());
    }
  }

} // namespace detail

#if !defined(GENERATING_DOCUMENTATION)

// Handler traits specialisation for promise_handler.
template <typename T>
class async_result<detail::promise_handler<T> >
{
public:
  // The initiating function will return a future.
  typedef std::future<T> type;

  // Constructor creates a new promise for the async operation, and obtains the
  // corresponding future.
  explicit async_result(detail::promise_handler<T>& h)
  {
    value_ = h.promise_->get_future();
  }

  // Obtain the future to be returned from the initiating function.
  type get() { return std::move(value_); }

private:
  type value_;
};

// Handler type specialisation for use_future.
template <typename Allocator, typename ReturnType>
struct handler_type<use_future_t<Allocator>, ReturnType()>
{
  typedef detail::promise_handler<void> type;
};

// Handler type specialisation for use_future.
template <typename Allocator, typename ReturnType, typename Arg1>
struct handler_type<use_future_t<Allocator>, ReturnType(Arg1)>
{
  typedef detail::promise_handler<Arg1> type;
};

// Handler type specialisation for use_future.
template <typename Allocator, typename ReturnType>
struct handler_type<use_future_t<Allocator>,
    ReturnType(asio::error_code)>
{
  typedef detail::promise_handler<void> type;
};

// Handler type specialisation for use_future.
template <typename Allocator, typename ReturnType, typename Arg2>
struct handler_type<use_future_t<Allocator>,
    ReturnType(asio::error_code, Arg2)>
{
  typedef detail::promise_handler<Arg2> type;
};

#endif // !defined(GENERATING_DOCUMENTATION)

} // namespace asio

#include "asio/detail/pop_options.hpp"

#endif // ASIO_IMPL_USE_FUTURE_HPP