declare explicit structure constructor

src/output/proticdbml.cpp

@@ -11,7 +11,7 @@
  * This file is part of XTPcpp.
  *
  *     XTPcpp is free software: you can redistribute it and/or modify
- *     it under the terms of the GNU General Public License as published by
+ *     it under the terms of the GNU General Public License as published
  *     the Free Software Foundation, either version 3 of the License, or
  *     (at your option) any later version.
  *
@@ -513,6 +513,13 @@ getProticPeptideHitKey(const PeptideEvidence *p_peptide_evidence)
 
 struct ProticPeptideHit
 {
+  ProticPeptideHit(QString ikey, PeptideMatch ipeptide_match)
+    : key(ikey), peptide_match(ipeptide_match){};
+  ProticPeptideHit(const ProticPeptideHit &other)
+  {
+    key           = other.key;
+    peptide_match = other.peptide_match;
+  };
   bool
   operator==(const ProticPeptideHit &other) const
   {