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-rw-r--r--3rdparty/asio/src/examples/cpp03/allocation/server.cpp103
1 files changed, 75 insertions, 28 deletions
diff --git a/3rdparty/asio/src/examples/cpp03/allocation/server.cpp b/3rdparty/asio/src/examples/cpp03/allocation/server.cpp
index e26eb564918..ca69460ff14 100644
--- a/3rdparty/asio/src/examples/cpp03/allocation/server.cpp
+++ b/3rdparty/asio/src/examples/cpp03/allocation/server.cpp
@@ -2,7 +2,7 @@
// server.cpp
// ~~~~~~~~~~
//
-// Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com)
+// Copyright (c) 2003-2021 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)
@@ -12,7 +12,7 @@
#include <iostream>
#include <boost/aligned_storage.hpp>
#include <boost/array.hpp>
-#include <boost/bind.hpp>
+#include <boost/bind/bind.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <boost/noncopyable.hpp>
#include <boost/shared_ptr.hpp>
@@ -24,11 +24,11 @@ using asio::ip::tcp;
// 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
+class handler_memory
: private boost::noncopyable
{
public:
- handler_allocator()
+ handler_memory()
: in_use_(false)
{
}
@@ -66,19 +66,78 @@ private:
bool in_use_;
};
+// The allocator to be associated with the handler objects. This allocator only
+// needs to satisfy the C++11 minimal allocator requirements, plus rebind when
+// targeting C++03.
+template <typename T>
+class handler_allocator
+{
+public:
+ typedef T value_type;
+
+ explicit handler_allocator(handler_memory& mem)
+ : memory_(mem)
+ {
+ }
+
+ template <typename U>
+ handler_allocator(const handler_allocator<U>& other)
+ : memory_(other.memory_)
+ {
+ }
+
+ template <typename U>
+ struct rebind
+ {
+ typedef handler_allocator<U> other;
+ };
+
+ bool operator==(const handler_allocator& other) const
+ {
+ return &memory_ == &other.memory_;
+ }
+
+ bool operator!=(const handler_allocator& other) const
+ {
+ return &memory_ != &other.memory_;
+ }
+
+ T* allocate(std::size_t n) const
+ {
+ return static_cast<T*>(memory_.allocate(sizeof(T) * n));
+ }
+
+ void deallocate(T* p, std::size_t /*n*/) const
+ {
+ return memory_.deallocate(p);
+ }
+
+//private:
+ // The underlying memory.
+ handler_memory& memory_;
+};
+
// Wrapper class template for handler objects to allow handler memory
-// allocation to be customised. Calls to operator() are forwarded to the
-// encapsulated handler.
+// allocation to be customised. The allocator_type typedef and get_allocator()
+// member function are used by the asynchronous operations to obtain the
+// allocator. 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),
+ typedef handler_allocator<Handler> allocator_type;
+
+ custom_alloc_handler(handler_memory& m, Handler h)
+ : memory_(m),
handler_(h)
{
}
+ allocator_type get_allocator() const
+ {
+ return allocator_type(memory_);
+ }
+
template <typename Arg1>
void operator()(Arg1 arg1)
{
@@ -91,29 +150,17 @@ public:
handler_(arg1, arg2);
}
- 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_memory& memory_;
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)
+ handler_memory& m, Handler h)
{
- return custom_alloc_handler<Handler>(a, h);
+ return custom_alloc_handler<Handler>(m, h);
}
class session
@@ -133,7 +180,7 @@ public:
void start()
{
socket_.async_read_some(asio::buffer(data_),
- make_custom_alloc_handler(allocator_,
+ make_custom_alloc_handler(handler_memory_,
boost::bind(&session::handle_read,
shared_from_this(),
asio::placeholders::error,
@@ -147,7 +194,7 @@ public:
{
asio::async_write(socket_,
asio::buffer(data_, bytes_transferred),
- make_custom_alloc_handler(allocator_,
+ make_custom_alloc_handler(handler_memory_,
boost::bind(&session::handle_write,
shared_from_this(),
asio::placeholders::error)));
@@ -159,7 +206,7 @@ public:
if (!error)
{
socket_.async_read_some(asio::buffer(data_),
- make_custom_alloc_handler(allocator_,
+ make_custom_alloc_handler(handler_memory_,
boost::bind(&session::handle_read,
shared_from_this(),
asio::placeholders::error,
@@ -174,8 +221,8 @@ private:
// Buffer used to store data received from the client.
boost::array<char, 1024> data_;
- // The allocator to use for handler-based custom memory allocation.
- handler_allocator allocator_;
+ // The memory to use for handler-based custom memory allocation.
+ handler_memory handler_memory_;
};
typedef boost::shared_ptr<session> session_ptr;