#pragma implementation (C++ only)
In IBM® XL C/C++ for AIX® 16.1.0 or earlier releases, when used with the -qtempinc option, #pragma implementation supplies the name of the file that contains the template definitions corresponding to the template declarations contained in a header file.
In IBM Open XL C/C++ for AIX 17.1.4, neither #pragma implementation nor -qtempinc is supported. Use C++11 explicit template instantiations instead, which is a standard-compliant means of managing where template instantiations occur.