Accecpt iterators by value in logger ctor insted of ref

include/spdlog/async_logger.h

@@ -46,7 +46,7 @@ class async_logger final : public std::enable_shared_from_this<async_logger>, pu
 
 public:
     template<typename It>
-    async_logger(std::string logger_name, const It &begin, const It &end, std::weak_ptr<details::thread_pool> tp,
+    async_logger(std::string logger_name, It begin, It end, std::weak_ptr<details::thread_pool> tp,
         async_overflow_policy overflow_policy = async_overflow_policy::block);
 
     async_logger(std::string logger_name, sinks_init_list sinks_list, std::weak_ptr<details::thread_pool> tp,

include/spdlog/details/async_logger_impl.h

@@ -16,7 +16,7 @@
 
 template<typename It>
 inline spdlog::async_logger::async_logger(
-    std::string logger_name, const It &begin, const It &end, std::weak_ptr<details::thread_pool> tp, async_overflow_policy overflow_policy)
+    std::string logger_name, It begin, It end, std::weak_ptr<details::thread_pool> tp, async_overflow_policy overflow_policy)
     : logger(std::move(logger_name), begin, end)
     , thread_pool_(tp)
     , overflow_policy_(overflow_policy)

include/spdlog/details/logger_impl.h

@@ -13,7 +13,7 @@
 // create logger with given name, sinks and the default pattern formatter
 // all other ctors will call this one
 template<typename It>
-inline spdlog::logger::logger(std::string logger_name, const It &begin, const It &end)
+inline spdlog::logger::logger(std::string logger_name, It begin, It end)
     : name_(std::move(logger_name))
     , sinks_(begin, end)
     , level_(level::info)

include/spdlog/logger.h

@@ -36,7 +36,7 @@ public:
     logger(std::string name, sinks_init_list sinks);
 
     template<typename It>
-    logger(std::string name, const It &begin, const It &end);
+    logger(std::string name, It begin, It end);
 
     virtual ~logger();