add LOG_FORMAT.

UnitTest/Universal/BoostLogTest.cpp

@@ -4,4 +4,5 @@
 BOOST_AUTO_TEST_CASE(BoostLogTest) {
     boost::log::initialize();
     LOG(info) << "this is a test output.";
+    LOG_FORMAT(info, "i am %s, %d years old.", "amass", 29);
 }

Universal/BoostLog.h

@@ -216,6 +216,12 @@ BOOST_LOG_GLOBAL_LOGGER(location_logger, LocationLogger<boost::log::trivial::sev
     (AmassKeywords::LineTag = __LINE__) \
     (AmassKeywords::CategoryTag = #cat))
 
+#define LOG_FORMAT(lvl,...)\
+    auto xxx_size = snprintf(nullptr,0,__VA_ARGS__);\
+    std::string xxx_buffer(xxx_size,'\0');\
+    snprintf(xxx_buffer.data(),xxx_buffer.size(),__VA_ARGS__);\
+    LOG(lvl)<<std::move(xxx_buffer);
+
 // clang-format on
 
 #include "BoostLog.inl"