Synchronizing writing to output streams from multiple threads
std::cout is a global object of the std::ostream type. It is used to write text to the standard output console. Although writing to it is guaranteed to be thread-safe, this applies to just one invocation of the operator<<. Multiple such sequenced calls to operator<< can be interrupted and resumed later, making it necessary to employ synchronization mechanisms to avoid corrupted results. This applies to all scenarios where multiple threads operate on the same output stream. To simplify this scenario, C++20 introduced std::basic_osyncstream to provide a mechanism to synchronize threads writing to the same output stream. In this recipe, you will learn how to use this new utility.
How to do it…
To synchronize access to an output stream for writing from multiple threads, do the following:
- Include the
<syncstream>header. - Define a variable of the
std::osyncstreamtype to wrap...
