log cleanup (#969)

- Improvement: New `ZEN_SCOPED_LOG(Expr)` macro routes `ZEN_INFO`/`ZEN_WARN`/`ZEN_DEBUG` in the enclosing block through the given logger expression instead of the default
- Improvement: `BuildContainer`, `SaveOplog`, and `LoadOplogContext` now take a caller-provided `LoggerRef` so diagnostic messages route through the caller's logger

1 files changed, 5 insertions, 0 deletions

diff --git a/src/zencore/include/zencore/logging.h b/src/zencore/include/zencore/logging.h
index 8c236d09b..cf011fb1a 100644
--- a/src/zencore/include/zencore/logging.h
+++ b/src/zencore/include/zencore/logging.h
@@ -175,6 +175,11 @@ using zen::Log;
 #define ZEN_ERROR(fmtstr, ...)	  ZEN_LOG_WITH_LOCATION(Log(), zen::logging::Err, fmtstr, ##__VA_ARGS__)
 #define ZEN_CRITICAL(fmtstr, ...) ZEN_LOG_WITH_LOCATION(Log(), zen::logging::Critical, fmtstr, ##__VA_ARGS__)
 
+// Routes ZEN_INFO / ZEN_WARN / ZEN_DEBUG etc. in the enclosing scope through the given logger expression
+// (a LoggerRef or something convertible, e.g. a member or a context field) instead of the namespace default.
+// Expand at block scope; the resulting local `Log` shadows `zen::Log()` for the rest of the block.
+#define ZEN_SCOPED_LOG(Expr) auto Log = [&]() { return (Expr); }
+
 #define ZEN_CONSOLE_LOG(InLevel, fmtstr, ...)                                                                                 \
 	do                                                                                                                        \
 	{                                                                                                                         \