cpp: Add API to obtain mutliple remarks

* lang/cpp/src/key.cpp, lang/cpp/src/key.h (UserID::remarks): New.
* NEWS: Mention this.

--
This can be useful if we want to show remarks made by others, too.

For:
GnuPG-Bug-Id: T4734

1 files changed, 16 insertions, 0 deletions

diff --git a/lang/cpp/src/key.cpp b/lang/cpp/src/key.cpp
index e2d91a10..5108a6ee 100644
--- a/lang/cpp/src/key.cpp
+++ b/lang/cpp/src/key.cpp
@@ -777,6 +777,22 @@ const char *UserID::remark(const Key &remarker, Error &err) const
     return nullptr;
 }
 
+std::vector<std::string> UserID::remarks(std::vector<Key> keys, Error &err) const
+{
+    std::vector<std::string> ret;
+
+    for (const auto &key: keys) {
+        const char *rem = remark(key, err);
+        if (err) {
+            return ret;
+        }
+        if (rem) {
+            ret.push_back(rem);
+        }
+    }
+    return ret;
+}
+
 //
 //
 // class Signature