This is an unofficial snapshot of the ISO/IEC JTC1 SC22 WG21 Core Issues List revision 117a. See http://www.open-std.org/jtc1/sc22/wg21/ for the official list.
2025-04-13
460. Can a using-declaration name a namespace?Section: 9.10 [namespace.udecl] Status: CD1 Submitter: John Spicer Date: 12 Feb 2004[Voted into WP at April 2005 meeting.]
Can a using-declaration be used to import a namespace?
namespace my_namespace{
namespace my_namespace2 {
int function_of_my_name_space(){ return 2;}
}
}
int main (){
using ::my_namespace::my_namespace2;
return my_namespace2::function_of_my_name_space();
}
Several popular compilers give an error on this, but there doesn't seem to be anything in 9.10 [namespace.udecl] that prohibits it. It should be noted that the user can get the same effect by using a namespace alias:
namespace my_namespace2 = ::my_namespace::my_namespace2;
Notes from the March 2004 meeting:
We agree that it should be an error.
Proposed resolution (October, 2004):
Add the following as a new paragraph after 9.10 [namespace.udecl] paragraph 5:
A using-declaration shall not name a namespace;
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