Duplicate const qualifier allowed in C but not in C++?

Question

Sample code snippet

const const const int x = 10;   
int main()
{}

gets compiled in C but not in C++. Why does it get compiled in C? I thou

Answer 1

The C++0x grammar appears to allow it:

cv-qualifier-seq:

• cv-qualifier cv-qualifier-seq opt

cv-qualifier:

  const

  volatile

---

Also, [decl.type.cv] appears to allow it:

There are two cv-qualifiers, const and volatile. If a cv-qualifier appears in a decl-specifier-seq, the init-declarator-list of the declaration shall not be empty. [ Note: 3.9.3 and 8.3.5 describe how cv-qualifiers affect object and function types. — end note ] Redundant cv-qualifications are ignored. [ Note: For example, these could be introduced by typedefs. — end note ]