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-rw-r--r--3rdparty/asio/src/examples/cpp14/executors/async_2.cpp79
1 files changed, 79 insertions, 0 deletions
diff --git a/3rdparty/asio/src/examples/cpp14/executors/async_2.cpp b/3rdparty/asio/src/examples/cpp14/executors/async_2.cpp
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index 00000000000..ee4a72e80c3
--- /dev/null
+++ b/3rdparty/asio/src/examples/cpp14/executors/async_2.cpp
@@ -0,0 +1,79 @@
+#include <asio/associated_executor.hpp>
+#include <asio/bind_executor.hpp>
+#include <asio/execution.hpp>
+#include <asio/static_thread_pool.hpp>
+#include <iostream>
+#include <string>
+
+using asio::bind_executor;
+using asio::get_associated_executor;
+using asio::static_thread_pool;
+namespace execution = asio::execution;
+
+// A function to asynchronously read a single line from an input stream.
+template <class IoExecutor, class Handler>
+void async_getline(IoExecutor io_ex, std::istream& is, Handler handler)
+{
+ // Track work for the handler's associated executor.
+ auto work_ex = asio::prefer(
+ get_associated_executor(handler, io_ex),
+ execution::outstanding_work.tracked);
+
+ // Post a function object to do the work asynchronously.
+ asio::require(io_ex, execution::blocking.never).execute(
+ [&is, work_ex, handler=std::move(handler)]() mutable
+ {
+ std::string line;
+ std::getline(is, line);
+
+ // Pass the result to the handler, via the associated executor.
+ asio::prefer(work_ex, execution::blocking.possibly).execute(
+ [line=std::move(line), handler=std::move(handler)]() mutable
+ {
+ handler(std::move(line));
+ });
+ });
+}
+
+// A function to asynchronously read multiple lines from an input stream.
+template <class IoExecutor, class Handler>
+void async_getlines(IoExecutor io_ex, std::istream& is, std::string init, Handler handler)
+{
+ // Track work for the I/O executor.
+ auto io_work_ex = asio::prefer(io_ex,
+ execution::outstanding_work.tracked);
+
+ // Track work for the handler's associated executor.
+ auto handler_work_ex = asio::prefer(
+ get_associated_executor(handler, io_ex),
+ execution::outstanding_work.tracked);
+
+ // Use the associated executor for each operation in the composition.
+ async_getline(io_work_ex, is,
+ bind_executor(handler_work_ex,
+ [io_work_ex, &is, lines=std::move(init), handler=std::move(handler)]
+ (std::string line) mutable
+ {
+ if (line.empty())
+ handler(lines);
+ else
+ async_getlines(io_work_ex, is, lines + line + "\n", std::move(handler));
+ }));
+}
+
+int main()
+{
+ static_thread_pool io_pool(1);
+ static_thread_pool completion_pool(1);
+
+ std::cout << "Enter text, terminating with a blank line:\n";
+
+ async_getlines(io_pool.executor(), std::cin, "",
+ bind_executor(completion_pool.executor(), [](std::string lines)
+ {
+ std::cout << "Lines:\n" << lines << "\n";
+ }));
+
+ io_pool.wait();
+ completion_pool.wait();
+}