Replace QOlmError with OlmErrorCode

QOlmError represents a subset of OlmErrorCode, and the associated
fromString() function uses undocumented strings produced inside Olm;
meanwhile OlmErrorCode is documented in its own header file. Each QOlm*
class now has lastErrorCode() next to lastError() (that, from now,
returns a textual representation straight from Olm, not QOlmError enum).

Also: including olm/error.h in e2ee/e2ee.h required some rearrangement
of the code to make sure non-E2EE configuration still builds.

1 files changed, 17 insertions, 0 deletions

diff --git a/lib/util.h b/lib/util.h
index 9efda5d1..ab219488 100644
--- a/lib/util.h
+++ b/lib/util.h
@@ -111,6 +111,23 @@ private:
     iterator to;
 };
 
+template <typename T>
+class asKeyValueRange
+{
+public:
+    asKeyValueRange(T& data)
+        : m_data { data }
+    {}
+
+    auto begin() { return m_data.keyValueBegin(); }
+    auto end() { return m_data.keyValueEnd(); }
+
+private:
+    T &m_data;
+};
+template <typename T>
+asKeyValueRange(T&) -> asKeyValueRange<T>;
+
 /** A replica of std::find_first_of that returns a pair of iterators
  *
  * Convenient for cases when you need to know which particular "first of"