This is a very simple logger in and for C++ which can be used to log Traces and Levels:
Traces can be exported (thus enabled) like so: export TRACES=TEST
Logging on Traces which are not exported will result in no logging at all.
You can easily add Levels by modifying Logger.hpp's enum class LVL to your liking.
View main.cpp for an example.

This code is licensed under the MIT License.
You should have received a copy with this code.