Modern C++ logger classes for logging functions (thread-safe) in most native and modern C++17 or C++20.

• Log a message to /dev/null, stdout, file and file as xml.
• Log a message with severity of Verbose, Debug, Info, Warning, Error and Fatal.
• Log thread-safe from whole application.
• Use compile flag to avoid level below a specified level. Default is LOGGINGINFO.
• Log automatically file, line and function name from logging position (except Visual Studio builds)

mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE:STRING=Debug|Release ../modern.cpp.logger
make -j`nproc`

• FileLogger - Loggin to a file.
• Logger - General definition and logging to /dev/null.
• LoggerFactory - Loggin to all possible types, as configured.
• StdLogger - Loggin to stdout.
• XmlFileLogger - Loggin to a file as xml.