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-rw-r--r--lib/asio/detail/call_stack.hpp125
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diff --git a/lib/asio/detail/call_stack.hpp b/lib/asio/detail/call_stack.hpp
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--- a/lib/asio/detail/call_stack.hpp
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-//
-// detail/call_stack.hpp
-// ~~~~~~~~~~~~~~~~~~~~~
-//
-// Copyright (c) 2003-2018 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_DETAIL_CALL_STACK_HPP
-#define ASIO_DETAIL_CALL_STACK_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-#include "asio/detail/noncopyable.hpp"
-#include "asio/detail/tss_ptr.hpp"
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-namespace detail {
-
-// Helper class to determine whether or not the current thread is inside an
-// invocation of io_context::run() for a specified io_context object.
-template <typename Key, typename Value = unsigned char>
-class call_stack
-{
-public:
- // Context class automatically pushes the key/value pair on to the stack.
- class context
- : private noncopyable
- {
- public:
- // Push the key on to the stack.
- explicit context(Key* k)
- : key_(k),
- next_(call_stack<Key, Value>::top_)
- {
- value_ = reinterpret_cast<unsigned char*>(this);
- call_stack<Key, Value>::top_ = this;
- }
-
- // Push the key/value pair on to the stack.
- context(Key* k, Value& v)
- : key_(k),
- value_(&v),
- next_(call_stack<Key, Value>::top_)
- {
- call_stack<Key, Value>::top_ = this;
- }
-
- // Pop the key/value pair from the stack.
- ~context()
- {
- call_stack<Key, Value>::top_ = next_;
- }
-
- // Find the next context with the same key.
- Value* next_by_key() const
- {
- context* elem = next_;
- while (elem)
- {
- if (elem->key_ == key_)
- return elem->value_;
- elem = elem->next_;
- }
- return 0;
- }
-
- private:
- friend class call_stack<Key, Value>;
-
- // The key associated with the context.
- Key* key_;
-
- // The value associated with the context.
- Value* value_;
-
- // The next element in the stack.
- context* next_;
- };
-
- friend class context;
-
- // Determine whether the specified owner is on the stack. Returns address of
- // key if present, 0 otherwise.
- static Value* contains(Key* k)
- {
- context* elem = top_;
- while (elem)
- {
- if (elem->key_ == k)
- return elem->value_;
- elem = elem->next_;
- }
- return 0;
- }
-
- // Obtain the value at the top of the stack.
- static Value* top()
- {
- context* elem = top_;
- return elem ? elem->value_ : 0;
- }
-
-private:
- // The top of the stack of calls for the current thread.
- static tss_ptr<context> top_;
-};
-
-template <typename Key, typename Value>
-tss_ptr<typename call_stack<Key, Value>::context>
-call_stack<Key, Value>::top_;
-
-} // namespace detail
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#endif // ASIO_DETAIL_CALL_STACK_HPP