This is what I currently use in my project. Including this file from C++ source would result in undefining macros and defining appropriate templates. Including from C source should have no effect because of macro guards.
It uses some C++11 features so -std=gnu++0x flag should be passed to gcc. It also calls gcc specific abs realizations for floating point types so it is not possible to use this with compiler other than gcc.
I've also defined new and delete operators. As far as I understand they are already defined in latest arduino. So you may need to remove them to compile your project.
P.S. Using it shouldn't have any impact on program size or speed if you are using macros only with single variables.
cpp_utils.h (2.49 KB)