Is this std::ref behaviour logical?

Question

Consider this code:

#include 
#include 

int xx = 7;

template
void f1(T arg)
{
    arg += xx;
}

template

        

Answer 1

reference_wrapper has operator = and a non explicit constructor, see documentation.

So, even if it is surprising, it is the normal behaviour:

f2 rebinds the local reference_wrapper to xx.