What would be the best possible way to disable c++ code during runtime with the least overhead introduced

** Very Newbie Designer here... But love to discuss and work out the best solution possible! :)

Motivation: I want to add a tracing library, which needs to be optional in a complex and high performance disruptive need-based project.

I am thinking of using std::optional to propagate its data structures.

I am not able to find the best solution to enable and disable this library such that it produces least overhead to the running system, I have some things in mind on how to achive it:

• general, bool check

if(library_enabled) {

//do library stuff

}

• null all the functions definations + ptrs and covert all non nullables ( int, double etc ) to char

f(library_enabled) {

ptr func(arg 1, arg 2) {}

} else

void func(null) {}

can we think of some better way to solve this design problem, taking performance in mind?