Update the FixtureLog

Now the FixtureLog is an Log::Observer instead of a backend. The
observer can sniff and filter log messages, that can be used
for fail a test if it emits a warning for example.

1 files changed, 12 insertions, 0 deletions

diff --git a/include/mbgl/platform/log.hpp b/include/mbgl/platform/log.hpp
index e6b8f17b65..de7f131714 100644
--- a/include/mbgl/platform/log.hpp
+++ b/include/mbgl/platform/log.hpp
@@ -11,6 +11,18 @@
 namespace mbgl {
 
 class Log {
+public:
+    class Observer {
+    public:
+        virtual ~Observer() = default;
+
+        // When an observer is set, this function will be called for every log
+        // message. Returning true will consume the message.
+        virtual bool onRecord(EventSeverity severity, Event event, int64_t code, const std::string &msg) = 0;
+    };
+
+    static void setObserver(std::unique_ptr<Observer> Observer);
+
 private:
     template <typename T, size_t N>
     constexpr static bool includes(const T e, const T (&l)[N], const size_t i = 0) {