incremented define?

Question

Is there anyways to have a define increment every time you use it?

For example

int a = ADEFINE;
int b = ADEFINE;

a is 1 and b is 2.

Answer 1

You can use __COUNTER__, though it's not standard. Both MSVC++ and GCC support it.

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If you can use boost, the pre-processor library has an implementation of counter. Here's the example from the documentation:

#include 

BOOST_PP_COUNTER // 0

#include BOOST_PP_UPDATE_COUNTER()

BOOST_PP_COUNTER // 1

#include BOOST_PP_UPDATE_COUNTER()

BOOST_PP_COUNTER // 2

#include BOOST_PP_UPDATE_COUNTER()

BOOST_PP_COUNTER // 3

(Kudo's to gf)