eic-opticks/sysrap/SLabelCache.hh

0001 #pragma once
0002
0003 /**
0004 SLabelCache.hh
0005 ===============
0006
0007 Used from X4::MakeSurfaceIndexCache to
0008 create cache of surface void* pointers and
0009 an integer index.
0010
0011 **/
0012
0013 #include "SYSRAP_API_EXPORT.hh"
0014 #include <unordered_map>
0015
0016 template <typename T>
0017 struct SYSRAP_API SLabelCache
0018 {
0019     typedef std::unordered_map<const void*, T>  MVT ;
0020
0021     T missing ;
0022     MVT cache ;
0023
0024     SLabelCache( T missing );
0025
0026     void add(const void* obj, T label);
0027     T find(const void* obj) ;
0028 };
0029
0030
0031 template <typename T>
0032 SLabelCache<T>::SLabelCache(T missing_) : missing(missing_) {}
0033
0034 template <typename T>
0035 inline void SLabelCache<T>::add(const void* obj, T label)
0036 {
0037     cache[obj] = label ;
0038 }
0039
0040 /**
0041 SLabelCache::find
0042 -------------------
0043
0044 Returns the label associated with the obj by SLabelCache::add
0045
0046 **/
0047
0048 template <typename T>
0049 inline T SLabelCache<T>::find(const void* obj)
0050 {
0051     typename MVT::const_iterator en = cache.end();
0052     typename MVT::const_iterator it = cache.find( obj );
0053     return it == en ? missing : it->second ;
0054 }
0055
0056