http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51897
Bug #: 51897
Summary: command line option to create a namespace alias
Classification: Unclassified
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: c++
AssignedTo: [email protected]
ReportedBy: [email protected]
In C, the compiler driver allows the
-Dxxx=yyy
option, so programs can be parameterized based on such definition.
In C++, we could do likewise with namespaces.
For example:
namespace Version1
{
void f() { /* version 1 implementation */ }
typedef int MyInt;
}
namespace Version2
{
void f() { /* version 2 implementation */ }
typedef long long int MyInt;
}
then, if we could have a namespace alias such as
namespace NM = Version1;
we could happily do:
NM::f();
NM::MyInt myInt;
Therefore, I suggest to add a new command line option to the driver to define
namespace alias, a C++ counterpart of the C macro definition.
For example, we could do
--namespace_alias NM=Version1
or alike when compiling stuff.
Yes, this can also be done with macros, but it's a cleaner preprocessor-free
choice.
