Is there an equivalent of Python's `pass` in c++ std11?

Question

I want a statement that does nothing but can be used in places requiring a statement. Pass: http://docs.python.org/release/2.5.2/ref/pass.html

Edit: Just saw: How does one execute a no-op in C/C++?

#define pass (void)0 

Solved my problem. Thanks!

Answer 1

A null statement (just Semicolon), or empty brackets should work for you

For example Python's

while some_condition():    # presumably one that eventually turns false     pass 

Could translate to the following C++

while (/* some condition */)     ; 

Or

while (/* some condition */) {} 

Perhaps for the ternary operator case, you could do:

x > y ? do_something() : true; 

Answer 2

No. You don't have pass or equivalent keyword. But you can write equivalent code without any such keyword.

def f():    pass 

becomes

void f() {} 

and

 class C:      pass 

becomes

 class C {}; 

In different context, different syntax could be useful. For example,

 class MyError(Exception):         pass 

becomes

class MyError : public std::exception {       using std::exception::exception; //inherits constructor! }; 

As you can see, in this context, you've to write using to inherits constructors from the base class. In Python, pass does the similar thing, in similar context.

Hope that helps.