Add JLOG macro

src/ripple/basics/Log.h

@@ -219,6 +219,13 @@ private:
         beast::Journal::Severity severity, std::string const& partition);
 };
 
+
+// Wraps a Journal::Stream to skip evaluation of
+// expensive argument lists if the stream is not active.
+#ifndef JLOG
+#define JLOG(x) if((x))(x)
+#endif
+
 //------------------------------------------------------------------------------
 // VFALCO DEPRECATED Temporary transition function until interfaces injected
 inline
@@ -233,13 +240,14 @@ deprecatedLogs()
 #define ShouldLog(s, k) \
     ::ripple::deprecatedLogs()[#k].active(::ripple::Logs::toSeverity (s))
 
+// DEPRECATED
 #define WriteLog(s, k)                                              \
     if (!ShouldLog(s, k))                                           \
         do {} while (0);                                            \
     else                                                            \
         ::beast::Journal::Stream (::ripple::deprecatedLogs()[#k],   \
                                   ::ripple::Logs::toSeverity(s))
-
+// DEPRECATED
 #define CondLog(c, s, k) \
      if (!ShouldLog(s, k) || !(c))                                  \
          do {} while(0);                                            \