Can I safely use OpenMP with C++11?

Question

The OpenMP standard only considers C++ 98 (ISO/IEC 14882:1998). This means that there is no standard supporting usage of OpenMP under C++03 or even C++11. Thus, any program

Answer 1

OpenMP 5.0 now defines the interaction towards C++11. But generally using anything from C++11 and further "may result in unspecified behavior".

This OpenMP API specification refers to ISO/IEC 14882:2011 as C++11. While future versions of the OpenMP specification are expected to address the following features, currently their use may result in unspecified behavior.

• Alignment support
• Standard layout types
• Allowing move constructs to throw
• Defining move special member functions
• Concurrency
• Data-dependency ordering: atomics and memory model
• Additions to the standard library
• Thread-local storage
• Dynamic initialization and destruction with concurrency
• C++11 library