C++ Binary Literal

I know that Binary Literal in C++ is standardized from C++14.

However, although I fix the std as c++11, it works well. Because actually, I expected an error. The following is my code which I expected an error.

int main(){
  int a = 0b1010; // an error is expected
  std::cout << a << std::endl;
}

Also, I have compiled and executed the above file with the following command.

g++ -std=c++11 -Wall main.cpp -o runfile
./runfile

What is the reason that an expected result does not come out? Is there something that I’ve got wrong?

>Solution :

Binary literals have been a compiler extension in GCC long before C++14 standardized them. You can compile with -pedantic to warn on extensions and -pedantic-errors to elevate those specific warnings to errors:

<source>:3:11: error: binary constants are a C++14 feature or GCC extension
    3 |   int a = 0b1010; // an error is expected
      |           ^~~~~~