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0001 #ifndef Framework_es_Label_h
0002 #define Framework_es_Label_h
0003 // -*- C++ -*-
0004 //
0005 // Package:     Framework
0006 // Class  :     es_Label
0007 //
0008 /**\class es_Label es_Label.h FWCore/Framework/interface/es_Label.h
0009 
0010    Description: Used to assign labels to data items produced by an ESProducer
0011 
0012    Usage:
0013    See the header file for ESProducer for detail examples
0014 
0015 */
0016 //
0017 // Original Author:  Chris Jones
0018 //         Created:  Fri Sep 30 09:35:20 EDT 2005
0019 //
0020 
0021 // system include files
0022 #include <memory>
0023 #include <string>
0024 #include <string_view>
0025 #include <vector>
0026 
0027 // user include files
0028 #include "FWCore/Utilities/interface/EDMException.h"
0029 #include "FWCore/Utilities/interface/Algorithms.h"
0030 
0031 // forward declarations
0032 
0033 namespace edm::es {
0034 
0035   template <typename T, int ILabel>
0036   struct L {
0037     using element_type = T;
0038 
0039     L() = default;
0040     explicit L(std::shared_ptr<T> iP) : product_{std::move(iP)} {}
0041     explicit L(std::unique_ptr<T> iP) : product_{std::move(iP)} {}
0042     explicit L(T* iP) : product_(iP) {}
0043 
0044     T& operator*() { return *product_; }
0045     T* operator->() { return product_.get(); }
0046     T const& operator*() const { return *product_; }
0047     T const* operator->() const { return product_.get(); }
0048     mutable std::shared_ptr<T> product_{nullptr};
0049   };
0050 
0051   template <int ILabel, typename T>
0052   L<T, ILabel> l(std::shared_ptr<T>& iP) {
0053     return L<T, ILabel>{iP};
0054   }
0055 
0056   struct Label {
0057     Label() = default;
0058     Label(const char* iLabel) : default_{iLabel} {}
0059     Label(const std::string& iString) : default_{iString} {}
0060     Label(const std::string& iString, unsigned int const iIndex) : labels_(iIndex + 1, def()) {
0061       labels_[iIndex] = iString;
0062     }
0063 
0064     Label& operator()(const std::string& iString, unsigned int const iIndex) {
0065       if (iIndex == labels_.size()) {
0066         labels_.push_back(iString);
0067       } else if (iIndex > labels_.size()) {
0068         std::vector<std::string> temp(iIndex + 1, def());
0069         copy_all(labels_, temp.begin());
0070         labels_.swap(temp);
0071       } else {
0072         if (labels_[iIndex] != def()) {
0073           Exception e(errors::Configuration, "Duplicate Label");
0074           e << "The index " << iIndex << " was previously assigned the label \"" << labels_[iIndex]
0075             << "\" and then was later assigned \"" << iString << "\"";
0076           e.raise();
0077         }
0078         labels_[iIndex] = iString;
0079       }
0080       return *this;
0081     }
0082     Label& operator()(int iIndex, const std::string& iString) { return (*this)(iString, iIndex); }
0083 
0084     static const std::string& def() {
0085       static const std::string s_def("\n\t");
0086       return s_def;
0087     }
0088 
0089     std::vector<std::string> labels_{};
0090     std::string default_{};
0091   };
0092 
0093   inline Label label(const std::string& iString, int iIndex) { return Label(iString, iIndex); }
0094   inline Label label(int iIndex, const std::string& iString) { return Label(iString, iIndex); }
0095 }  // namespace edm::es
0096 
0097 #endif