c++ - Change a variable reference after his initialization -

in c++ standard can read (8.5.3.2 pag.202)

"a reference cannot changed refer object after initialization."

but following code

#include <iostream> #include <functional>  int main(int argc, const char * argv[]) {     int = 1;     int &j = i;      j = 2; // ok, == 2      int k = 3;      j = std::ref(k);      std::cout << "j = " << j << ", = " << << std::endl;      return 0; } 

that produces output

j = 3, = 3 

is realy wrong? compiler's "feature" or c++ language's "feature"? compiled code's fragment either on mac (llvm 5.1) , windows (vs2010).

the line

 j = std::ref(k); 

has same effect has

 j = k 

that reference std::ref(k) implicitly dereferenced before assignement k i. no wonder behavior seeing. proof, change code as

int = 1; int &j = i; j = 2; // ok, == 2 int k = 3; j = std::ref(k); std::cout << "j = " << j << ", = " << << std::endl; k = 5; std::cout << "j = " << j << ", = " << << std::endl; 

then output is

j = 3, = 3 j = 3, = 3 

which shows j not reference k. changing k doesn't change j.