Fixed #1197

include/spdlog/async_logger-inl.h

@@ -83,3 +83,10 @@ SPDLOG_INLINE void spdlog::async_logger::backend_flush_()
         SPDLOG_LOGGER_CATCH()
     }
 }
+
+SPDLOG_INLINE std::shared_ptr<spdlog::logger> spdlog::async_logger::clone(std::string new_name)
+{
+    auto cloned = std::make_shared<spdlog::async_logger>(*this);
+    cloned->name_ = std::move(new_name);
+    return cloned;
+}

include/spdlog/async_logger.h

@@ -49,6 +49,8 @@ public:
     async_logger(std::string logger_name, sink_ptr single_sink, std::weak_ptr<details::thread_pool> tp,
         async_overflow_policy overflow_policy = async_overflow_policy::block);
 
+    std::shared_ptr<logger> clone(std::string new_name) override;
+
 protected:
     void sink_it_(const details::log_msg &msg) override;
     void flush_() override;

include/spdlog/fmt/bin_to_hex.h

@@ -122,7 +122,6 @@ struct formatter<spdlog::details::bytes_range<T>>
         auto inserter = ctx.out();
 #endif
 
-
         for (auto &item : the_range)
         {
             auto ch = static_cast<unsigned char>(item);

include/spdlog/logger-inl.h

@@ -162,6 +162,14 @@ SPDLOG_INLINE void logger::set_error_handler(err_handler handler)
     custom_err_handler_ = handler;
 }
 
+// create new logger with same sinks and configuration.
+SPDLOG_INLINE std::shared_ptr<logger> logger::clone(std::string logger_name)
+{
+    auto cloned = std::make_shared<logger>(*this);
+    cloned->name_ = std::move(logger_name);
+    return cloned;
+}
+
 // protected methods
 SPDLOG_INLINE void logger::sink_it_(const details::log_msg &msg)
 {

include/spdlog/logger.h

@@ -356,6 +356,9 @@ public:
     // error handler
     void set_error_handler(err_handler);
 
+    // create new logger with same sinks and configuration.
+    virtual std::shared_ptr<logger> clone(std::string logger_name);
+
 protected:
     std::string name_;
     std::vector<sink_ptr> sinks_;

tests/test_misc.cpp

@@ -1,5 +1,7 @@
 #include "includes.h"
 #include "test_sink.h"
+#include "spdlog/fmt/bin_to_hex.h"
+
 
 template<class T>
 std::string log_info(const T &what, spdlog::level::level_enum logger_level = spdlog::level::info)
@@ -92,7 +94,54 @@ TEST_CASE("periodic flush", "[periodic_flush]")
     spdlog::drop_all();
 }
 
-#include "spdlog/fmt/bin_to_hex.h"
+TEST_CASE("clone-logger", "[clone]")
+{
+    using namespace spdlog;
+    auto test_sink = std::make_shared<sinks::test_sink_mt>();
+    auto logger = std::make_shared<spdlog::logger>("orig", test_sink);
+    logger->set_pattern("%v");
+    auto cloned = logger->clone("clone");
+
+    REQUIRE(cloned->name() == "clone");
+    REQUIRE(logger->sinks() == cloned->sinks());
+    REQUIRE(logger->level() == cloned->level());
+    REQUIRE(logger->flush_level() == cloned->flush_level());
+    logger->info("Some message 1");
+    cloned->info("Some message 2");
+
+    REQUIRE(test_sink->lines().size()==2);
+    REQUIRE(test_sink->lines()[0] == "Some message 1");
+    REQUIRE(test_sink->lines()[1] == "Some message 2");
+
+    spdlog::drop_all();
+}
+
+TEST_CASE("clone async", "[clone]")
+{
+    using namespace spdlog;
+
+    spdlog::init_thread_pool(4, 1);
+    auto test_sink = std::make_shared<sinks::test_sink_st >();
+    auto logger = std::make_shared<spdlog::async_logger>("orig", test_sink, spdlog::thread_pool());
+    logger->set_pattern("%v");
+    auto cloned = logger->clone("clone");
+
+    REQUIRE(cloned->name() == "clone");
+    REQUIRE(logger->sinks() == cloned->sinks());
+    REQUIRE(logger->level() == cloned->level());
+    REQUIRE(logger->flush_level() == cloned->flush_level());
+
+    logger->info("Some message 1");
+    cloned->info("Some message 2");
+
+    spdlog::details::os::sleep_for_millis(10);
+
+    REQUIRE(test_sink->lines().size()==2);
+    REQUIRE(test_sink->lines()[0] == "Some message 1");
+    REQUIRE(test_sink->lines()[1] == "Some message 2");
+
+    spdlog::drop_all();
+}
 
 TEST_CASE("to_hex", "[to_hex]")
 {