Following !29873 (merged)
class BoundaryCheck
0051 {
..............
0063
0064 bool checkLoc1; //!< check local 1 coordinate
0065 bool checkLoc2; //!< check local 2 coordinate
0066
0067 double toleranceLoc1; //!< absolute tolerance in local 1 coordinate
0068 double toleranceLoc2; //!< absolute tolerance in local 2 coordinate
0069
0070 int nSigmas; //!< allowed sigmas for chi2 boundary check
0071 AmgSymMatrix(2) lCovariance; //!< local covariance matrix
0072
0073 BoundaryCheckType bcType;
...........It seems to carry a bit of non trivial payload. Pass it around by reference rather than copy.