According to the documentation:
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* @return If the descriptor does not include grb::descriptors::structural |
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* nor grb::descriptors::structural_complement and if \a assigned |
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* is false, then the entry is ignored and uninterpreted, thus |
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* returning \a false. |
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* @return If the descriptor includes grb::descriptors::invert_mask, |
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* returns the negation of the dereferenced value of \a val |
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* which is first cast to a \a bool. |
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* @return Otherwise, returns the dereferenced value of \a val, |
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* cast to a \a bool. |
However, if the descriptor invert_mask is set and assigned is set to false, then the return value will be true:
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bool ret = false; |
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// if we request a structural mask, decide only on passed assigned variable |
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if( descriptor & descriptors::structural ) { |
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ret = assigned; |
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} else { |
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// if based on value, if there is a value, cast it to bool |
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if( assigned ) { |
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ret = static_cast< bool >( val[ offset ] ); |
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} |
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// otherwise there is no value and false is assumed |
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} |
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// check whether we should return the inverted value |
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if( descriptor & descriptors::invert_mask ) { |
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return !ret; |
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} else { |
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return ret; |
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} |
