log: allow setting the default_sink

log/level.hpp

@@ -12,6 +12,10 @@
 
 #include <string>
 
+// Windows.h or one of its friends defines a macro 'ERROR'. Screw Microsoft.
+#ifdef ERROR
+#undef ERROR
+#endif
 
 namespace cruft::log {
     ///////////////////////////////////////////////////////////////////////////

log/log.cpp

@@ -14,6 +14,7 @@
 
 #include "sink/console.hpp"
 
+#include <mutex>
 #include <map>
 #include <string>
 
@@ -42,11 +43,30 @@ cruft::log::needs_break (level_t level)
 
 
 ///////////////////////////////////////////////////////////////////////////////
+static std::once_flag s_sink_init;
+static std::unique_ptr<cruft::log::sink::base> s_default_sink;
+
+
+//-----------------------------------------------------------------------------
+cruft::log::sink::base&
+cruft::log::default_sink (std::unique_ptr<sink::base> value)
+{
+    s_default_sink = std::move (value);
+    return *s_default_sink;
+}
+
+
+//-----------------------------------------------------------------------------
 cruft::log::sink::base&
 cruft::log::default_sink ()
 {
-    static sink::console s_default_sink (PACKAGE_NAME);
+    std::call_once (s_sink_init, [&] () {
-    return s_default_sink;
+        default_sink (
+            std::make_unique<sink::console> (PACKAGE_NAME)
+        );
+    });
+
+    return *s_default_sink;
 }
 
 

log/log.hpp

@@ -13,19 +13,17 @@
 #include "sink/base.hpp"
 #include "../format.hpp"
 
-
+#include <memory>
-#include <iosfwd>
 #include <string>
 
-// Windows.h or one of its friends defines a macro 'ERROR'. Screw Microsoft.
-#ifdef ERROR
-#undef ERROR
-#endif
 
 namespace cruft::log {
     ///////////////////////////////////////////////////////////////////////////
     sink::base& default_sink (void);
+    sink::base& default_sink (std::unique_ptr<sink::base>);
 
+
+    //-------------------------------------------------------------------------
     void write (level_t, std::string const &msg);
     void write (level_t, char const *msg);
     void write (level_t, std::string_view msg);