Cpp: Handle empty recipients consistently

* lang/cpp/src/context.cpp (Context::getKeysFromRecipients):
New helper.
(Context::encrypt, Context::startEncryption, Context::signAndEncrypt)
(Context::startCombinedSigningAndEncryption): Use new helper.
* lang/cpp/src/context.h (Context::getKeysFromRecipients): Add
as private helper.

--
bf776ce was incomplete as the code to handle recpients
was duplicated four times. This is now unified and constently
uses a nullptr instead of an empty array.

1 files changed, 5 insertions, 0 deletions

diff --git a/lang/cpp/src/context.h b/lang/cpp/src/context.h
index 70ab079f..7d7f53a6 100644
--- a/lang/cpp/src/context.h
+++ b/lang/cpp/src/context.h
@@ -369,6 +369,11 @@ public:
         return d;
     }
 private:
+    // Helper functions that need to be context because they rely
+    // on the "Friendlyness" of context to access the gpgme types.
+    gpgme_key_t *const getKeysFromRecipients(const std::vector<Key> &recipients);
+
+private:
     Private *const d;
 
 private: // disable...