You need to first download the https://github.com/c42f/tinyformat/blob/master/tinyformat.h header and put it together with debugger.h.

This was first published on https://github.com/evandrocoan/InteractiveGraphicSystem/blob/master/src/debugger.h

To use this, just build the debugger.hpp and debugger.cpp with -DTINYFORMAT_FORMATTER_DEBUGGER_LEVEL=127+4096 and linking debugger.cpp with your project files, while including the debugger.h file headers where you would like to use it.

$ g++ -o main.exe -g -ggdb debugger.cpp test_debugger.cpp -DTINYFORMAT_FORMATTER_DEBUGGER_LEVEL=127 && ./main.exe
$ g++ -o main.exe -g -ggdb debugger.cpp test_debugger.cpp -DTINYFORMAT_FORMATTER_DEBUGGER_LEVEL=127 --std=c++98 && ./main.exe
$ g++ -o main.exe -g -ggdb debugger.cpp test_debugger.cpp -DTINYFORMAT_FORMATTER_DEBUGGER_LEVEL=127 --std=c++11 && ./main.exe

test_debugger.cpp Output result:

First test
2019/12/05 15:33:43.447807 0.000096 test_debugger.cpp|main:7 Hi
2019/12/05 15:33:43.447872 0.000016 test_debugger.cpp|main:8 Hi 1
2019/12/05 15:33:43.447913 0.000035 test_debugger.cpp|main:9 tinyformat: Too many conversion specifiers in format string: 'Hi %s'
2019/12/05 15:33:43.447987 0.000068 test_debugger.cpp|main:10 tinyformat: Too many conversion specifiers in format string: 'Hi %s %s'
Second test
test_debugger.cpp|main:13 Hi
test_debugger.cpp|main:14 Hi 1
test_debugger.cpp|main:15 tinyformat: Too many conversion specifiers in format string: 'Hi %s'
test_debugger.cpp|main:16 tinyformat: Too many conversion specifiers in format string: 'Hi %s %s'
Third test
2019/12/05 15:33:43.448108 0.000116 Hi
2019/12/05 15:33:43.448119 0.000005 Hi 1
2019/12/05 15:33:43.448147 0.000023 tinyformat: Too many conversion specifiers in format string: 'Hi %s'
2019/12/05 15:33:43.448181 0.000029 tinyformat: Too many conversion specifiers in format string: 'Hi %s %s'

There is not need to specify any other format specifier other than "%s", unless you would like custom behavior.

By default, this logging system will be disabled and no changes are required by any project using this include.

When enabled, it will create a file on stderr.log. The file stderr.log will contain all messaged outputted to the stderr stream, i.e., both std::cerr << "My message" << std::endl; or LOG(1, "My message"); are going to be in that file.

It uses the http://www.cplusplus.com/reference/cstdio/freopen/ function from <cstdio> and it works with legacy C++ 98 code.