Fastest way to alias a function name

So I'm wrapping GL Mathematics library (GLM) to replace my game engine's current vector mathematics system. I would like to keep all the naming conventions I've used so far.

For renaming classes, this is easy:

#include <glm/glm.hpp>
namespace BromineEngine {
    typedef glm::vec4 Vec4f;
    ...
}

However, function are more complicated. I need to make sure the function is still in the BromineEngine namespace.

I thought about doing a macro inside the namespace, but afaik macros don't respect namespaces. I could also just make templated functions that forward the arguments, but this seems slow.

Any help?