stdwclog

stdwclog refers to the wide-character logging output stream in the C++ standard library, commonly accessed as std::wclog. It is the wide-character counterpart to std::clog and is defined in the header <iostream> as a global object of type std::basic_ostream<wchar_t>. std::wclog is intended for diagnostic or logging output that may include non-ASCII characters and is typically used similarly to other standard logging streams.

Like std::clog, std::wclog is generally buffered, and its output is typically directed to the standard error stream, allowing log messages to be separated from standard output. The exact buffering behavior and the underlying destination are implementation-defined, but they usually align with the platform conventions for standard error.

Usage is straightforward: you insert wide-character data using the insertion operator, for example, std::wclog << L"Initialization complete" << std::endl;. Because it is a streaming interface, you can combine it with manipulators and formatting just as with other iostreams. Character encoding depends on wchar_t and the system locale; to ensure correct Unicode output, set the appropriate locale and ensure the terminal supports the encoding.

Thread-safety and performance notes: iostreams are not guaranteed to be thread-safe, so concurrent writes to std::wclog from multiple threads can interleave unless proper synchronization is used.

Compatibility: std::wclog is part of the C++ standard library and is supported by major compilers (GCC, Clang, MSVC) across common platforms. See also std::wcout, std::wcerr, std::clog, and their narrow-character counterparts.