Prevent clang-tidy warnings

[ClausKlein]

With clang-tidy I have checked the examples only and got some warnings;
You may see all warnings at the attached log file.

bash-3.2$ builddriver run-clang-tidy.py -p build/standalone '-checks=-*,-modernize-*,misc-*,hicpp-*,cert-*,readability-*,portability-*,performance-*,-cppcore*' standalone
builddriver executing: 'run-clang-tidy.py -p build/standalone -checks=-*,-modernize-*,misc-*,hicpp-*,cert-*,readability-*,portability-*,performance-*,-cppcore* standalone'
Compilation SUCCEED in 6.70547 seconds
Number of warnings: 4
WarningErrorEntry(path='/Users/clausklein/Workspace/cpp/cxx.simplelog/standalone/main.example_syslog.cpp', lineno='64', severity='warning', message="initialization of 'rootLog' with static storage duration may throw an exception that cannot be caught [cert-err58-cpp]", column='32')
WarningErrorEntry(path='/Users/clausklein/Workspace/cpp/cxx.simplelog/standalone/main.example_syslog.cpp', lineno='102', severity='warning', message='use of a signed integer operand with a binary bitwise operator [hicpp-signed-bitwise]', column='22')
WarningErrorEntry(path='/Users/clausklein/Workspace/cpp/cxx.simplelog/standalone/main.example_syslog.cpp', lineno='102', severity='warning', message='use of a signed integer operand with a binary bitwise operator [hicpp-signed-bitwise]', column='55')
WarningErrorEntry(path='/Users/clausklein/Workspace/cpp/cxx.simplelog/standalone/main.example_spdlog.cpp', lineno='109', severity='warning', message="initialization of 'rootLog' with static storage duration may throw an exception that cannot be caught [cert-err58-cpp]", column='32')
For full log, please open: /var/folders/wb/ckvxxgls5db7qyhqq4y5_l1c0000gq/T/build-kn3wnhad.log
bash-3.2$