CODEWITHSUNDEEP
c++c++11c++03
qdii
qdii

Reputation: 12983

Is it legal to define override in C++03

We have a project that’s using many C++11 facilities, and we thought about this trick to make it compile on C++03.

#ifndef USE_CPP0X
#    define override
#endif

As far as I know it’s forbidden to define C++ keywords, so is this legal?

Upvotes: 2

Views: 761

Answers (2)

Andrew Medlin
Andrew Medlin

Reputation: 461

Even more explicit in terms of using 'override' for C++11 and above would be:

#if __cplusplus >= 201103L
#define OVERRIDE override
#else
#define OVERRIDE
#endif

The value 201103L is the standard agreed for C++11. The macro __cplusplus is sure to be defined unless you're using an ancient compiler.

Upvotes: 3

Some programmer dude
Some programmer dude

Reputation: 409462

It is somewhat frowned upon, but it's certainly possible. A better and not so frowned upon variant is to define macros in all large letter, something like

#ifndef USE_CPP0x
#  define OVERRIDE
#else
#  define OVERRIDE override
#endif

Then remember to use OVERRIDE instead of override where wanted.

Upvotes: 7

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