cvSeqSort        1709 modules/core/include/opencv2/core/core_c.h CVAPI(void) cvSeqSort( CvSeq* seq, CvCmpFunc func, void* userdata CV_DEFAULT(NULL) );
cvSeqSort        3743 modules/core/src/persistence.cpp     cvSeqSort( elements, icvSortIdxCmpFunc, &dims );
cvSeqSort        1149 modules/core/test/test_ds.cpp                     cvSeqSort( seq, icvCmpSeqElems, seq );