What does C++ language definition say about the extent of the static keyword?

Question

In C++, if I have a class:

class Example {
  static int s_One, s_Two;

  ...
};

Does the language clearly define that s_Two is also static?

In other words, does the static keyword extent go everywhere the int goes, or can it be like * and only apply to one variable?

Austronesia

This question can be answered by reading the standard. But, why don't you simply remove the ambiguity by declaring each variable on its own? – Altruistic

@JesperJuhl: Arguably, most answers about C++ can be answered by reading the standard. But the standard is big and sometimes difficult to navigate. – Prolong

@JesperJuhl The answer might also be valuable to other people. – Turgid

it would be pretty stupid to not apply all the declarators to all the variables introduced by the declaration... "C++: hold my beer int* a, b" – Shanell

Answer 1

Yes, it applies to every name in that declaration:

[dcl.stc]/1: [..] At most one storage-class-specifier shall appear in a given decl-specifier-seq [..] The storage-class-specifier applies to the name declared by each init-declarator in the list [..]

Atman

Answer 2

According to the C++ 17 Standard (10 Declarations)

2 A simple-declaration or nodeclspec-function-declaration of the form

attribute-specifier-seqopt decl-specifier-seqopt init-declarator-listopt ;

And (10.1 Specifiers):

1 The specifiers that can be used in a declaration are

decl-specifier:
    storage-class-specifier
    ...

So in this declaration

static int s_One, s_Two;

the decl-specifier-seq contains two decl-specifiers, static (storage class specifier) and int. Thus the storage class specifier static describes the both variables in the init-declarator-list s_One and s_Two.

Perl

That's not enough; this doesn't show that the SCS applies to both, just that is possible. – Karrah

I'd still write static int s_One; static int s_Two;. Much more readable and unambiguous. – Altruistic

@JesperJuhl No, this is invalid C++ syntax. – Perl

No, it is not. Why do you say it is invalid? – Chopping

@VladfromMoscow why? – Rapp

@VladfromMoscow How is declaring two separate static ints invalid syntax? – Altruistic

@Chopping I did not see that there is a semicolon instead of comma.:) – Perl

@Karrah What is not enough for you? – Perl