22 #ifndef XAPIAN_INCLUDED_VALUESTATS_H    23 #define XAPIAN_INCLUDED_VALUESTATS_H    50         lower_bound.resize(0);
    51         upper_bound.resize(0);
 Class to hold statistics for a given slot. 
 
std::string upper_bound
An upper bound on the values stored in the given value slot. 
 
Xapian::doccount freq
The number of documents which have a (non-empty) value stored in the slot. 
 
std::string lower_bound
A lower bound on the values stored in the given value slot. 
 
ValueStats()
Construct an empty ValueStats object. 
 
unsigned XAPIAN_DOCID_BASE_TYPE doccount
A count of documents. 
 
void clear()
Clear the statistics.