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OPAL master does not compile with NOCPLUSPLUS11_NULLPTR=ON

OPAL master does not compile (gcc 4.8.5) with build option NOCPLUSPLUS11_NULLPTR=ON with the following error:

src/Classic/AbsBeamline/RFCavity.cpp:152:27: error: call of overloaded ‘unique_ptr(NULL)’ is ambiguous frequency_td_m(nullptr)

This comes from:

RNormal_m(nullptr)

which is defined as

std::unique_ptr<double[]> RNormal_m;

With NOCPLUSPLUS11_NULLPTR this is translated to RNormal_m(NULL), for which multiple constructors are possible.

Since there is already quite a bit of C++11 in OPAL, instead of fixing I would suggest (but with caution as I don't know the reason for the build option) to remove the NOCPLUSPLUS11_NULLPTR (and perhaps also the similar NOCPLUSPLUS11_FOREACH).