Common/interface/AssociationMapHelpers.h

0001 #ifndef DataFormats_Common_AssociationMapKeyVal_h
0002 #define DataFormats_Common_AssociationMapKeyVal_h
0003 /*
0004  *
0005  * helper classes for AssociationMap
0006  *
0007  * \author Luca Lista, INFN
0008  *
0009  *
0010  */
0011 #include "DataFormats/Provenance/interface/ProductID.h"
0012 #include "FWCore/Utilities/interface/EDMException.h"
0013
0014 #include <utility>
0015
0016 namespace edm {
0017
0018   class EDProductGetter;
0019
0020   namespace helpers {
0021     template <typename K, typename V>
0022     struct KeyVal {
0023       typedef K key_type;
0024       typedef V value_type;
0025       KeyVal() : key(), val() {}
0026       KeyVal(const K& k, const V& v) : key(k), val(v) {}
0027       template <typename K_, typename V_>
0028       KeyVal(K_&& k, V_&& v) : key(std::forward<K_>(k)), val(std::forward<V_>(v)) {}
0029
0030       KeyVal(EDProductGetter const* getter) : key(ProductID(), getter), val(ProductID(), getter) {}
0031
0032       K key;
0033       V val;
0034     };
0035
0036     template <typename K>
0037     struct Key {
0038       typedef K key_type;
0039       Key() {}
0040       Key(const K& k) : key(k) {}
0041       template <typename K_>
0042       Key(K_&& k) : key(std::forward<K_>(k)) {}
0043
0044       Key(EDProductGetter const* getter) : key(ProductID(), getter) {}
0045
0046       K key;
0047     };
0048
0049     /// throw if r hasn't the same id as rp
0050     template <typename RP, typename R>
0051     void checkRef(const RP& rp, const R& r) {
0052       if (rp.id() != r.id()) {
0053         Exception::throwThis(edm::errors::InvalidReference, "invalid reference");
0054       }
0055     }
0056   }  // namespace helpers
0057 }  // namespace edm
0058
0059 #endif