What header file needs to be included for using nullptr in g++?

Question

I am using g++ 4.4.1 and want to use nullptr, but I am not being able to find which header file is required to be included. It does not seem to be keyword eithe

Answer 1

GCC 4.4.1 does not support nullptr.

Support for nullptr was added in GCC 4.6.0: http://gcc.gnu.org/gcc-4.6/changes.html

Improved experimental support for the upcoming C++0x ISO C++ standard, including support for nullptr (thanks to Magnus Fromreide), noexcept, unrestricted unions, range-based for loops (thanks to Rodrigo Rivas Costa), implicitly deleted functions and implicit move constructors.

For earlier versions of GCC, if you want to experiment with nullptr you can try the workaround in this SO question:

Can nullptr be emulated in GCC?