Arduino Stream Logger

Library opens posibility of logging by using ostream.
When log level is disabled (by adding -D LOG_LEVEL_DISABLED or removing -D LOG_LEVEL_..) then all strings, operators calls, etc. will be optimized/removed from binary.

Using

Use as follows:

#include <Logger.h>
...
LOG_DEBUG << "debug";
LOG_INFO << "info";
LOG_WARNING << "warning";
LOG_ERROR << "error";

Optimization aspects

Compiler will not optimize function calls.
For example, in case of LOG_LEVEL_INFO and debug with function call:

LOG_DEBUG << foo();

Compiler optimize only logging, but foo() will be called.
Following macro will help to optimize all:

LOG_CALL_DEBUG(<< foo());

Additional format options

Disable prefix:

build_flags =
	-D LOG_FORMAT_WITHOUT_PREFIX

Custom separator:

build_flags =
	-D LOG_FORMAT_SEPARATOR='"\\\\"'

Default separator is ": ".

Configuration

Library require c++17 or newer.
For PlatformIO. Add to platformio.ini:

build_flags =
	-std=c++17
	-std=gnu++17
	-D LOG_LEVEL_INFO
build_unflags =
	-std=gnu++11

For Arduino IDE. At boards package installation folder create platform.local.txt:

compiler.cpp.extra_flags=-std=c++17 -D LOG_LEVEL_INFO