Pedro J. Estébanez e9b7640f84 Make error handling more convenient ...

By adding some PRAY_* macros that encapsulate both the check and the returning of a null reference (UB).
Plus transient avoidance of the flood of warnings emitted by Clang when checking 'this' for NULL.
Plus explanation about the do-while(0) loop in some error macros.

2017-07-05 09:31:37 +02:00

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