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-rw-r--r--3rdparty/asio/src/examples/cpp14/executors/async_2.cpp68
1 files changed, 68 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
new file mode 100644
index 00000000000..b39156dcb23
--- /dev/null
+++ b/3rdparty/asio/src/examples/cpp14/executors/async_2.cpp
@@ -0,0 +1,68 @@
+#include <asio/ts/executor.hpp>
+#include <asio/thread_pool.hpp>
+#include <iostream>
+#include <string>
+
+using asio::bind_executor;
+using asio::dispatch;
+using asio::get_associated_executor;
+using asio::make_work_guard;
+using asio::post;
+using asio::thread_pool;
+
+// A function to asynchronously read a single line from an input stream.
+template <class Handler>
+void async_getline(std::istream& is, Handler handler)
+{
+ // Create executor_work for the handler's associated executor.
+ auto work = make_work_guard(handler);
+
+ // Post a function object to do the work asynchronously.
+ post([&is, work, handler=std::move(handler)]() mutable
+ {
+ std::string line;
+ std::getline(is, line);
+
+ // Pass the result to the handler, via the associated executor.
+ dispatch(work.get_executor(),
+ [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 Handler>
+void async_getlines(std::istream& is, std::string init, Handler handler)
+{
+ // Get the final handler's associated executor.
+ auto ex = get_associated_executor(handler);
+
+ // Use the associated executor for each operation in the composition.
+ async_getline(is,
+ bind_executor(ex,
+ [&is, lines=std::move(init), handler=std::move(handler)]
+ (std::string line) mutable
+ {
+ if (line.empty())
+ handler(lines);
+ else
+ async_getlines(is, lines + line + "\n", std::move(handler));
+ }));
+}
+
+int main()
+{
+ thread_pool pool;
+
+ std::cout << "Enter text, terminating with a blank line:\n";
+
+ async_getlines(std::cin, "",
+ bind_executor(pool, [](std::string lines)
+ {
+ std::cout << "Lines:\n" << lines << "\n";
+ }));
+
+ pool.join();
+}