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Diffstat (limited to 'doc/html/boost_asio/example/cpp11/allocation/server.cpp')
-rw-r--r-- | doc/html/boost_asio/example/cpp11/allocation/server.cpp | 215 |
1 files changed, 0 insertions, 215 deletions
diff --git a/doc/html/boost_asio/example/cpp11/allocation/server.cpp b/doc/html/boost_asio/example/cpp11/allocation/server.cpp deleted file mode 100644 index ce7223ebe7..0000000000 --- a/doc/html/boost_asio/example/cpp11/allocation/server.cpp +++ /dev/null @@ -1,215 +0,0 @@ -// -// server.cpp -// ~~~~~~~~~~ -// -// Copyright (c) 2003-2015 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) -// - -#include <array> -#include <cstdlib> -#include <iostream> -#include <memory> -#include <type_traits> -#include <utility> -#include <boost/asio.hpp> - -using boost::asio::ip::tcp; - -// Class to manage the memory to be used for handler-based custom allocation. -// It contains a single block of memory which may be returned for allocation -// requests. If the memory is in use when an allocation request is made, the -// allocator delegates allocation to the global heap. -class handler_allocator -{ -public: - handler_allocator() - : in_use_(false) - { - } - - handler_allocator(const handler_allocator&) = delete; - handler_allocator& operator=(const handler_allocator&) = delete; - - void* allocate(std::size_t size) - { - if (!in_use_ && size < sizeof(storage_)) - { - in_use_ = true; - return &storage_; - } - else - { - return ::operator new(size); - } - } - - void deallocate(void* pointer) - { - if (pointer == &storage_) - { - in_use_ = false; - } - else - { - ::operator delete(pointer); - } - } - -private: - // Storage space used for handler-based custom memory allocation. - typename std::aligned_storage<1024>::type storage_; - - // Whether the handler-based custom allocation storage has been used. - bool in_use_; -}; - -// Wrapper class template for handler objects to allow handler memory -// allocation to be customised. Calls to operator() are forwarded to the -// encapsulated handler. -template <typename Handler> -class custom_alloc_handler -{ -public: - custom_alloc_handler(handler_allocator& a, Handler h) - : allocator_(a), - handler_(h) - { - } - - template <typename ...Args> - void operator()(Args&&... args) - { - handler_(std::forward<Args>(args)...); - } - - friend void* asio_handler_allocate(std::size_t size, - custom_alloc_handler<Handler>* this_handler) - { - return this_handler->allocator_.allocate(size); - } - - friend void asio_handler_deallocate(void* pointer, std::size_t /*size*/, - custom_alloc_handler<Handler>* this_handler) - { - this_handler->allocator_.deallocate(pointer); - } - -private: - handler_allocator& allocator_; - Handler handler_; -}; - -// Helper function to wrap a handler object to add custom allocation. -template <typename Handler> -inline custom_alloc_handler<Handler> make_custom_alloc_handler( - handler_allocator& a, Handler h) -{ - return custom_alloc_handler<Handler>(a, h); -} - -class session - : public std::enable_shared_from_this<session> -{ -public: - session(tcp::socket socket) - : socket_(std::move(socket)) - { - } - - void start() - { - do_read(); - } - -private: - void do_read() - { - auto self(shared_from_this()); - socket_.async_read_some(boost::asio::buffer(data_), - make_custom_alloc_handler(allocator_, - [this, self](boost::system::error_code ec, std::size_t length) - { - if (!ec) - { - do_write(length); - } - })); - } - - void do_write(std::size_t length) - { - auto self(shared_from_this()); - boost::asio::async_write(socket_, boost::asio::buffer(data_, length), - make_custom_alloc_handler(allocator_, - [this, self](boost::system::error_code ec, std::size_t /*length*/) - { - if (!ec) - { - do_read(); - } - })); - } - - // The socket used to communicate with the client. - tcp::socket socket_; - - // Buffer used to store data received from the client. - std::array<char, 1024> data_; - - // The allocator to use for handler-based custom memory allocation. - handler_allocator allocator_; -}; - -class server -{ -public: - server(boost::asio::io_service& io_service, short port) - : acceptor_(io_service, tcp::endpoint(tcp::v4(), port)), - socket_(io_service) - { - do_accept(); - } - -private: - void do_accept() - { - acceptor_.async_accept(socket_, - [this](boost::system::error_code ec) - { - if (!ec) - { - std::make_shared<session>(std::move(socket_))->start(); - } - - do_accept(); - }); - } - - tcp::acceptor acceptor_; - tcp::socket socket_; -}; - -int main(int argc, char* argv[]) -{ - try - { - if (argc != 2) - { - std::cerr << "Usage: server <port>\n"; - return 1; - } - - boost::asio::io_service io_service; - server s(io_service, std::atoi(argv[1])); - io_service.run(); - } - catch (std::exception& e) - { - std::cerr << "Exception: " << e.what() << "\n"; - } - - return 0; -} |