cpp: Allow merging the results of two imports

* lang/cpp/src/importresult.h, lang/cpp/src/importresult.cpp (class
ImportResult): Add member function mergeWith.
--

This allows creating a consolidated result of several independent
imports. If the import results to merge considered the same keys, then
not all counts can be consolidated correctly, but the important numbers
like the number of considered keys, the number of imported keys, the
number of unchanged keys and the numbers of new user IDs, subkeys,
signatures and revocations should be correct.

GnuPG-bug-id: 5951

1 files changed, 10 insertions, 0 deletions

diff --git a/lang/cpp/src/importresult.h b/lang/cpp/src/importresult.h
index bcd956c3..59366984 100644
--- a/lang/cpp/src/importresult.h
+++ b/lang/cpp/src/importresult.h
@@ -60,6 +60,16 @@ public:
         swap(this->d, other.d);
     }
 
+    /**
+     * Merges the result @p other into this result (and all of its copies).
+     *
+     * @note The merge algorithm assumes that @p other is the result of an
+     * import that was performed after the import of this result.
+     * @note Some numbers cannot be consolidated reliably, e.g. the number of
+     * keys without user ID.
+     */
+    void mergeWith(const ImportResult &other);
+
     bool isNull() const;
 
     int numConsidered() const;