diff --git a/include/spdlog/async_logger-inl.h b/include/spdlog/async_logger-inl.h
index f8c9694c..9a651b71 100644
--- a/include/spdlog/async_logger-inl.h
+++ b/include/spdlog/async_logger-inl.h
@@ -84,7 +84,7 @@ SPDLOG_INLINE void spdlog::async_logger::backend_flush_()
     }
 }
 
-SPDLOG_INLINE std::shared_ptr<spdlog::logger> spdlog::async_logger::clone(std::string new_name)
+SPDLOG_INLINE std::shared_ptr<spdlog::logger> spdlog::async_logger::clone(std::string new_name) const&
 {
     auto cloned = std::make_shared<spdlog::async_logger>(*this);
     cloned->name_ = std::move(new_name);
diff --git a/include/spdlog/async_logger.h b/include/spdlog/async_logger.h
index 6f299672..ba116d44 100644
--- a/include/spdlog/async_logger.h
+++ b/include/spdlog/async_logger.h
@@ -49,7 +49,7 @@ 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;
+    std::shared_ptr<logger> clone(std::string new_name) const & override;
 
 protected:
     void sink_it_(const details::log_msg &msg) override;
diff --git a/include/spdlog/details/backtracer-inl.h b/include/spdlog/details/backtracer-inl.h
index 21553c26..6617b789 100644
--- a/include/spdlog/details/backtracer-inl.h
+++ b/include/spdlog/details/backtracer-inl.h
@@ -22,7 +22,7 @@ SPDLOG_INLINE backtracer::backtracer(backtracer &&other) SPDLOG_NOEXCEPT
     messages_ = std::move(other.messages_);
 }
 
-SPDLOG_INLINE backtracer &backtracer::operator=(backtracer other)
+SPDLOG_INLINE backtracer &backtracer::operator=(backtracer other) &
 {
     std::lock_guard<std::mutex> lock(mutex_);
     enabled_ = other.enabled();
diff --git a/include/spdlog/details/backtracer.h b/include/spdlog/details/backtracer.h
index 81736580..e92cc40c 100644
--- a/include/spdlog/details/backtracer.h
+++ b/include/spdlog/details/backtracer.h
@@ -26,7 +26,7 @@ public:
     backtracer(const backtracer &other);
 
     backtracer(backtracer &&other) SPDLOG_NOEXCEPT;
-    backtracer &operator=(backtracer other);
+    backtracer &operator=(backtracer other) &;
 
     void enable(size_t size);
     void disable();
@@ -43,4 +43,3 @@ public:
 #ifdef SPDLOG_HEADER_ONLY
 #include "backtracer-inl.h"
 #endif
-
diff --git a/include/spdlog/details/circular_q.h b/include/spdlog/details/circular_q.h
index 1f2712e7..0062e6c0 100644
--- a/include/spdlog/details/circular_q.h
+++ b/include/spdlog/details/circular_q.h
@@ -30,7 +30,7 @@ public:
     {}
 
     circular_q(const circular_q &) = default;
-    circular_q &operator=(const circular_q &) = default;
+    circular_q &operator=(const circular_q &) & = default;
 
     // move cannot be default,
     // since we need to reset head_, tail_, etc to zero in the moved object
@@ -39,14 +39,14 @@ public:
         copy_moveable(std::move(other));
     }
 
-    circular_q &operator=(circular_q &&other) SPDLOG_NOEXCEPT
+    circular_q &operator=(circular_q &&other) & SPDLOG_NOEXCEPT
     {
         copy_moveable(std::move(other));
         return *this;
     }
 
     // push back, overrun (oldest) item if no room left
-    void push_back(T &&item)
+    void push_back(T &&item) &
     {
         if (max_items_ > 0)
         {
@@ -63,16 +63,21 @@ public:
 
     // Return reference to the front item.
     // If there are no elements in the container, the behavior is undefined.
-    const T &front() const
+    const T &front() const &
     {
         return v_[head_];
     }
 
-    T &front()
+    T &front() &
     {
         return v_[head_];
     }
 
+    T front() &&
+    {
+        return std::move(v_[head_]);
+    }
+
     // Return number of elements actually stored
     size_t size() const
     {
@@ -96,7 +101,7 @@ public:
 
     // Pop item from front.
     // If there are no elements in the container, the behavior is undefined.
-    void pop_front()
+    void pop_front() &
     {
         head_ = (head_ + 1) % max_items_;
     }
diff --git a/include/spdlog/details/log_msg_buffer-inl.h b/include/spdlog/details/log_msg_buffer-inl.h
index ca9429bb..a4c9fcd8 100644
--- a/include/spdlog/details/log_msg_buffer-inl.h
+++ b/include/spdlog/details/log_msg_buffer-inl.h
@@ -26,14 +26,12 @@ SPDLOG_INLINE log_msg_buffer::log_msg_buffer(const log_msg_buffer &other)
     update_string_views();
 }
 
-SPDLOG_INLINE log_msg_buffer::log_msg_buffer(log_msg_buffer &&other) SPDLOG_NOEXCEPT 
-    : log_msg{other}
-    , buffer{std::move(other.buffer)}
+SPDLOG_INLINE log_msg_buffer::log_msg_buffer(log_msg_buffer &&other) SPDLOG_NOEXCEPT : log_msg{other}, buffer{std::move(other.buffer)}
 {
     update_string_views();
 }
 
-SPDLOG_INLINE log_msg_buffer &log_msg_buffer::operator=(const log_msg_buffer &other)
+SPDLOG_INLINE log_msg_buffer &log_msg_buffer::operator=(const log_msg_buffer &other) &
 {
     log_msg::operator=(other);
     buffer.clear();
@@ -42,7 +40,7 @@ SPDLOG_INLINE log_msg_buffer &log_msg_buffer::operator=(const log_msg_buffer &ot
     return *this;
 }
 
-SPDLOG_INLINE log_msg_buffer &log_msg_buffer::operator=(log_msg_buffer &&other) SPDLOG_NOEXCEPT
+SPDLOG_INLINE log_msg_buffer &log_msg_buffer::operator=(log_msg_buffer &&other) & SPDLOG_NOEXCEPT
 {
     log_msg::operator=(other);
     buffer = std::move(other.buffer);
diff --git a/include/spdlog/details/log_msg_buffer.h b/include/spdlog/details/log_msg_buffer.h
index 4410110f..db35f40e 100644
--- a/include/spdlog/details/log_msg_buffer.h
+++ b/include/spdlog/details/log_msg_buffer.h
@@ -21,8 +21,8 @@ public:
     explicit log_msg_buffer(const log_msg &orig_msg);
     log_msg_buffer(const log_msg_buffer &other);
     log_msg_buffer(log_msg_buffer &&other) SPDLOG_NOEXCEPT;
-    log_msg_buffer &operator=(const log_msg_buffer &other);
-    log_msg_buffer &operator=(log_msg_buffer &&other) SPDLOG_NOEXCEPT;
+    log_msg_buffer &operator=(const log_msg_buffer &other) &;
+    log_msg_buffer &operator=(log_msg_buffer &&other) & SPDLOG_NOEXCEPT;
 };
 
 } // namespace details
diff --git a/include/spdlog/details/mpmc_blocking_q.h b/include/spdlog/details/mpmc_blocking_q.h
index 5c3cca76..3202d12e 100644
--- a/include/spdlog/details/mpmc_blocking_q.h
+++ b/include/spdlog/details/mpmc_blocking_q.h
@@ -29,7 +29,7 @@ public:
 
 #ifndef __MINGW32__
     // try to enqueue and block if no room left
-    void enqueue(T &&item)
+    void enqueue(T &&item) &
     {
         {
             std::unique_lock<std::mutex> lock(queue_mutex_);
@@ -40,7 +40,7 @@ public:
     }
 
     // enqueue immediately. overrun oldest message in the queue if no room left.
-    void enqueue_nowait(T &&item)
+    void enqueue_nowait(T &&item) &
     {
         {
             std::unique_lock<std::mutex> lock(queue_mutex_);
@@ -71,7 +71,7 @@ public:
     // so release the mutex at the very end each function.
 
     // try to enqueue and block if no room left
-    void enqueue(T &&item)
+    void enqueue(T &&item) &
     {
         std::unique_lock<std::mutex> lock(queue_mutex_);
         pop_cv_.wait(lock, [this] { return !this->q_.full(); });
@@ -80,7 +80,7 @@ public:
     }
 
     // enqueue immediately. overrun oldest message in the queue if no room left.
-    void enqueue_nowait(T &&item)
+    void enqueue_nowait(T &&item) &
     {
         std::unique_lock<std::mutex> lock(queue_mutex_);
         q_.push_back(std::move(item));
@@ -104,20 +104,20 @@ public:
 
 #endif
 
-    size_t overrun_counter()
+    size_t overrun_counter() const
     {
         std::unique_lock<std::mutex> lock(queue_mutex_);
         return q_.overrun_counter();
     }
 
-    size_t size()
+    size_t size() const
     {
         std::unique_lock<std::mutex> lock(queue_mutex_);
         return q_.size();
     }
 
 private:
-    std::mutex queue_mutex_;
+    mutable std::mutex queue_mutex_;
     std::condition_variable push_cv_;
     std::condition_variable pop_cv_;
     spdlog::details::circular_q<T> q_;
diff --git a/include/spdlog/details/registry-inl.h b/include/spdlog/details/registry-inl.h
index a60faabc..e677f44c 100644
--- a/include/spdlog/details/registry-inl.h
+++ b/include/spdlog/details/registry-inl.h
@@ -51,13 +51,13 @@ SPDLOG_INLINE registry::registry()
 
 SPDLOG_INLINE registry::~registry() = default;
 
-SPDLOG_INLINE void registry::register_logger(std::shared_ptr<logger> new_logger)
+SPDLOG_INLINE void registry::register_logger(std::shared_ptr<logger> new_logger) &
 {
     std::lock_guard<std::mutex> lock(logger_map_mutex_);
     register_logger_(std::move(new_logger));
 }
 
-SPDLOG_INLINE void registry::initialize_logger(std::shared_ptr<logger> new_logger)
+SPDLOG_INLINE void registry::initialize_logger(std::shared_ptr<logger> new_logger) &
 {
     std::lock_guard<std::mutex> lock(logger_map_mutex_);
     new_logger->set_formatter(formatter_->clone());
@@ -109,7 +109,7 @@ SPDLOG_INLINE logger *registry::get_default_raw()
 
 // set default logger.
 // default logger is stored in default_logger_ (for faster retrieval) and in the loggers_ map.
-SPDLOG_INLINE void registry::set_default_logger(std::shared_ptr<logger> new_default_logger)
+SPDLOG_INLINE void registry::set_default_logger(std::shared_ptr<logger> new_default_logger) &
 {
     std::lock_guard<std::mutex> lock(logger_map_mutex_);
     // remove previous default logger from the map
@@ -124,7 +124,7 @@ SPDLOG_INLINE void registry::set_default_logger(std::shared_ptr<logger> new_defa
     default_logger_ = std::move(new_default_logger);
 }
 
-SPDLOG_INLINE void registry::set_tp(std::shared_ptr<thread_pool> tp)
+SPDLOG_INLINE void registry::set_tp(std::shared_ptr<thread_pool> tp) &
 {
     std::lock_guard<std::recursive_mutex> lock(tp_mutex_);
     tp_ = std::move(tp);
@@ -137,7 +137,7 @@ SPDLOG_INLINE std::shared_ptr<thread_pool> registry::get_tp()
 }
 
 // Set global formatter. Each sink in each logger will get a clone of this object
-SPDLOG_INLINE void registry::set_formatter(std::unique_ptr<formatter> formatter)
+SPDLOG_INLINE void registry::set_formatter(std::unique_ptr<formatter> formatter) &
 {
     std::lock_guard<std::mutex> lock(logger_map_mutex_);
     formatter_ = std::move(formatter);
@@ -147,7 +147,7 @@ SPDLOG_INLINE void registry::set_formatter(std::unique_ptr<formatter> formatter)
     }
 }
 
-SPDLOG_INLINE void registry::enable_backtrace(size_t n_messages)
+SPDLOG_INLINE void registry::enable_backtrace(size_t n_messages) &
 {
     std::lock_guard<std::mutex> lock(logger_map_mutex_);
     backtrace_n_messages_ = n_messages;
@@ -158,7 +158,7 @@ SPDLOG_INLINE void registry::enable_backtrace(size_t n_messages)
     }
 }
 
-SPDLOG_INLINE void registry::disable_backtrace()
+SPDLOG_INLINE void registry::disable_backtrace() &
 {
     std::lock_guard<std::mutex> lock(logger_map_mutex_);
     backtrace_n_messages_ = 0;
@@ -168,7 +168,7 @@ SPDLOG_INLINE void registry::disable_backtrace()
     }
 }
 
-SPDLOG_INLINE void registry::set_level(level::level_enum log_level)
+SPDLOG_INLINE void registry::set_level(level::level_enum log_level) &
 {
     std::lock_guard<std::mutex> lock(logger_map_mutex_);
     for (auto &l : loggers_)
@@ -178,7 +178,7 @@ SPDLOG_INLINE void registry::set_level(level::level_enum log_level)
     global_log_level_ = log_level;
 }
 
-SPDLOG_INLINE void registry::flush_on(level::level_enum log_level)
+SPDLOG_INLINE void registry::flush_on(level::level_enum log_level) &
 {
     std::lock_guard<std::mutex> lock(logger_map_mutex_);
     for (auto &l : loggers_)
@@ -188,14 +188,14 @@ SPDLOG_INLINE void registry::flush_on(level::level_enum log_level)
     flush_level_ = log_level;
 }
 
-SPDLOG_INLINE void registry::flush_every(std::chrono::seconds interval)
+SPDLOG_INLINE void registry::flush_every(std::chrono::seconds interval) &
 {
     std::lock_guard<std::mutex> lock(flusher_mutex_);
     auto clbk = [this]() { this->flush_all(); };
     periodic_flusher_ = details::make_unique<periodic_worker>(clbk, interval);
 }
 
-SPDLOG_INLINE void registry::set_error_handler(void (*handler)(const std::string &msg))
+SPDLOG_INLINE void registry::set_error_handler(void (*handler)(const std::string &msg)) &
 {
     std::lock_guard<std::mutex> lock(logger_map_mutex_);
     for (auto &l : loggers_)
@@ -261,13 +261,13 @@ SPDLOG_INLINE std::recursive_mutex &registry::tp_mutex()
     return tp_mutex_;
 }
 
-SPDLOG_INLINE void registry::set_automatic_registration(bool automatic_registration)
+SPDLOG_INLINE void registry::set_automatic_registration(bool automatic_registration) &
 {
     std::lock_guard<std::mutex> lock(logger_map_mutex_);
     automatic_registration_ = automatic_registration;
 }
 
-SPDLOG_INLINE void registry::set_levels(log_levels levels, level::level_enum *global_level)
+SPDLOG_INLINE void registry::set_levels(log_levels levels, level::level_enum *global_level) &
 {
     std::lock_guard<std::mutex> lock(logger_map_mutex_);
     log_levels_ = std::move(levels);
@@ -302,7 +302,7 @@ SPDLOG_INLINE void registry::throw_if_exists_(const std::string &logger_name)
     }
 }
 
-SPDLOG_INLINE void registry::register_logger_(std::shared_ptr<logger> new_logger)
+SPDLOG_INLINE void registry::register_logger_(std::shared_ptr<logger> new_logger) &
 {
     auto logger_name = new_logger->name();
     throw_if_exists_(logger_name);
diff --git a/include/spdlog/details/registry.h b/include/spdlog/details/registry.h
index b069c3f5..67660d53 100644
--- a/include/spdlog/details/registry.h
+++ b/include/spdlog/details/registry.h
@@ -31,8 +31,8 @@ public:
     registry(const registry &) = delete;
     registry &operator=(const registry &) = delete;
 
-    void register_logger(std::shared_ptr<logger> new_logger);
-    void initialize_logger(std::shared_ptr<logger> new_logger);
+    void register_logger(std::shared_ptr<logger> new_logger) &;
+    void initialize_logger(std::shared_ptr<logger> new_logger) &;
     std::shared_ptr<logger> get(const std::string &logger_name);
     std::shared_ptr<logger> default_logger();
 
@@ -44,26 +44,26 @@ public:
 
     // set default logger.
     // default logger is stored in default_logger_ (for faster retrieval) and in the loggers_ map.
-    void set_default_logger(std::shared_ptr<logger> new_default_logger);
+    void set_default_logger(std::shared_ptr<logger> new_default_logger) &;
 
-    void set_tp(std::shared_ptr<thread_pool> tp);
+    void set_tp(std::shared_ptr<thread_pool> tp) &;
 
     std::shared_ptr<thread_pool> get_tp();
 
     // Set global formatter. Each sink in each logger will get a clone of this object
-    void set_formatter(std::unique_ptr<formatter> formatter);
+    void set_formatter(std::unique_ptr<formatter> formatter) &;
 
-    void enable_backtrace(size_t n_messages);
+    void enable_backtrace(size_t n_messages) &;
 
-    void disable_backtrace();
+    void disable_backtrace() &;
 
-    void set_level(level::level_enum log_level);
+    void set_level(level::level_enum log_level) &;
 
-    void flush_on(level::level_enum log_level);
+    void flush_on(level::level_enum log_level) &;
 
-    void flush_every(std::chrono::seconds interval);
+    void flush_every(std::chrono::seconds interval) &;
 
-    void set_error_handler(void (*handler)(const std::string &msg));
+    void set_error_handler(void (*handler)(const std::string &msg)) &;
 
     void apply_all(const std::function<void(const std::shared_ptr<logger>)> &fun);
 
@@ -78,10 +78,10 @@ public:
 
     std::recursive_mutex &tp_mutex();
 
-    void set_automatic_registration(bool automatic_registration);
+    void set_automatic_registration(bool automatic_registration) &;
 
     // set levels for all existing/future loggers. global_level can be null if should not set.
-    void set_levels(log_levels levels, level::level_enum *global_level);
+    void set_levels(log_levels levels, level::level_enum *global_level) &;
 
     static registry &instance();
 
@@ -90,8 +90,9 @@ private:
     ~registry();
 
     void throw_if_exists_(const std::string &logger_name);
-    void register_logger_(std::shared_ptr<logger> new_logger);
+    void register_logger_(std::shared_ptr<logger> new_logger) &;
     bool set_level_from_cfg_(logger *logger);
+
     std::mutex logger_map_mutex_, flusher_mutex_;
     std::recursive_mutex tp_mutex_;
     std::unordered_map<std::string, std::shared_ptr<logger>> loggers_;
diff --git a/include/spdlog/details/tcp_client-windows.h b/include/spdlog/details/tcp_client-windows.h
index 7ee72927..88bc0e52 100644
--- a/include/spdlog/details/tcp_client-windows.h
+++ b/include/spdlog/details/tcp_client-windows.h
@@ -64,7 +64,7 @@ public:
         return socket_ != INVALID_SOCKET;
     }
 
-    void close()
+    void close() &
     {
         ::closesocket(socket_);
         socket_ = INVALID_SOCKET;
@@ -82,7 +82,7 @@ public:
     }
 
     // try to connect or throw on failure
-    void connect(const std::string &host, int port)
+    void connect(const std::string &host, int port) &
     {
         // initialize winsock if needed
         if (!winsock_initialized_())
diff --git a/include/spdlog/details/tcp_client.h b/include/spdlog/details/tcp_client.h
index 9f3bb99e..2790848b 100644
--- a/include/spdlog/details/tcp_client.h
+++ b/include/spdlog/details/tcp_client.h
@@ -31,7 +31,7 @@ public:
         return socket_ != -1;
     }
 
-    void close()
+    void close() &
     {
         if (is_connected())
         {
@@ -51,7 +51,7 @@ public:
     }
 
     // try to connect or throw on failure
-    void connect(const std::string &host, int port)
+    void connect(const std::string &host, int port) &
     {
         close();
         struct addrinfo hints
diff --git a/include/spdlog/details/thread_pool-inl.h b/include/spdlog/details/thread_pool-inl.h
index c1df4361..394335ea 100644
--- a/include/spdlog/details/thread_pool-inl.h
+++ b/include/spdlog/details/thread_pool-inl.h
@@ -63,17 +63,17 @@ void SPDLOG_INLINE thread_pool::post_flush(async_logger_ptr &&worker_ptr, async_
     post_async_msg_(async_msg(std::move(worker_ptr), async_msg_type::flush), overflow_policy);
 }
 
-size_t SPDLOG_INLINE thread_pool::overrun_counter()
+size_t SPDLOG_INLINE thread_pool::overrun_counter() const
 {
     return q_.overrun_counter();
 }
 
-size_t SPDLOG_INLINE thread_pool::queue_size()
+size_t SPDLOG_INLINE thread_pool::queue_size() const
 {
     return q_.size();
 }
 
-void SPDLOG_INLINE thread_pool::post_async_msg_(async_msg &&new_msg, async_overflow_policy overflow_policy)
+void SPDLOG_INLINE thread_pool::post_async_msg_(async_msg &&new_msg, async_overflow_policy overflow_policy) &
 {
     if (overflow_policy == async_overflow_policy::block)
     {
@@ -85,7 +85,7 @@ void SPDLOG_INLINE thread_pool::post_async_msg_(async_msg &&new_msg, async_overf
     }
 }
 
-void SPDLOG_INLINE thread_pool::worker_loop_()
+void SPDLOG_INLINE thread_pool::worker_loop_() &
 {
     while (process_next_msg_()) {}
 }
@@ -93,7 +93,7 @@ void SPDLOG_INLINE thread_pool::worker_loop_()
 // process next message in the queue
 // return true if this thread should still be active (while no terminate msg
 // was received)
-bool SPDLOG_INLINE thread_pool::process_next_msg_()
+bool SPDLOG_INLINE thread_pool::process_next_msg_() &
 {
     async_msg incoming_async_msg;
     bool dequeued = q_.dequeue_for(incoming_async_msg, std::chrono::seconds(10));
diff --git a/include/spdlog/details/thread_pool.h b/include/spdlog/details/thread_pool.h
index 61e25252..53910257 100644
--- a/include/spdlog/details/thread_pool.h
+++ b/include/spdlog/details/thread_pool.h
@@ -49,7 +49,7 @@ struct async_msg : log_msg_buffer
         , worker_ptr(std::move(other.worker_ptr))
     {}
 
-    async_msg &operator=(async_msg &&other)
+    async_msg &operator=(async_msg &&other) &
     {
         *static_cast<log_msg_buffer *>(this) = std::move(other);
         msg_type = other.msg_type;
@@ -58,7 +58,7 @@ struct async_msg : log_msg_buffer
     }
 #else // (_MSC_VER) && _MSC_VER <= 1800
     async_msg(async_msg &&) = default;
-    async_msg &operator=(async_msg &&) = default;
+    async_msg &operator=(async_msg &&) & = default;
 #endif
 
     // construct from log_msg with given type
@@ -96,21 +96,21 @@ public:
 
     void post_log(async_logger_ptr &&worker_ptr, const details::log_msg &msg, async_overflow_policy overflow_policy);
     void post_flush(async_logger_ptr &&worker_ptr, async_overflow_policy overflow_policy);
-    size_t overrun_counter();
-    size_t queue_size();
+    size_t overrun_counter() const;
+    size_t queue_size() const;
 
 private:
     q_type q_;
 
     std::vector<std::thread> threads_;
 
-    void post_async_msg_(async_msg &&new_msg, async_overflow_policy overflow_policy);
-    void worker_loop_();
+    void post_async_msg_(async_msg &&new_msg, async_overflow_policy overflow_policy) &;
+    void worker_loop_() &;
 
     // process next message in the queue
     // return true if this thread should still be active (while no terminate msg
     // was received)
-    bool process_next_msg_();
+    bool process_next_msg_() &;
 };
 
 } // namespace details
diff --git a/include/spdlog/logger-inl.h b/include/spdlog/logger-inl.h
index d01c08da..a39e2c83 100644
--- a/include/spdlog/logger-inl.h
+++ b/include/spdlog/logger-inl.h
@@ -34,13 +34,13 @@ SPDLOG_INLINE logger::logger(logger &&other) SPDLOG_NOEXCEPT : name_(std::move(o
 
 {}
 
-SPDLOG_INLINE logger &logger::operator=(logger other) SPDLOG_NOEXCEPT
+SPDLOG_INLINE logger &logger::operator=(logger other) & SPDLOG_NOEXCEPT
 {
     this->swap(other);
     return *this;
 }
 
-SPDLOG_INLINE void logger::swap(spdlog::logger &other) SPDLOG_NOEXCEPT
+SPDLOG_INLINE void logger::swap(spdlog::logger &other) & SPDLOG_NOEXCEPT
 {
     name_.swap(other.name_);
     sinks_.swap(other.sinks_);
@@ -64,7 +64,7 @@ SPDLOG_INLINE void swap(logger &a, logger &b)
     a.swap(b);
 }
 
-SPDLOG_INLINE void logger::set_level(level::level_enum log_level)
+SPDLOG_INLINE void logger::set_level(level::level_enum log_level) &
 {
     level_.store(log_level);
 }
@@ -74,14 +74,24 @@ SPDLOG_INLINE level::level_enum logger::level() const
     return static_cast<level::level_enum>(level_.load(std::memory_order_relaxed));
 }
 
-SPDLOG_INLINE const std::string &logger::name() const
+SPDLOG_INLINE std::string logger::name() &&
+{
+    return std::move(name_);
+}
+
+SPDLOG_INLINE const std::string &logger::name() const &
+{
+    return name_;
+}
+
+SPDLOG_INLINE std::string &logger::name() &
 {
     return name_;
 }
 
 // set formatting for the sinks in this logger.
 // each sink will get a separate instance of the formatter object.
-SPDLOG_INLINE void logger::set_formatter(std::unique_ptr<formatter> f)
+SPDLOG_INLINE void logger::set_formatter(std::unique_ptr<formatter> f) &
 {
     for (auto it = sinks_.begin(); it != sinks_.end(); ++it)
     {
@@ -98,20 +108,20 @@ SPDLOG_INLINE void logger::set_formatter(std::unique_ptr<formatter> f)
     }
 }
 
-SPDLOG_INLINE void logger::set_pattern(std::string pattern, pattern_time_type time_type)
+SPDLOG_INLINE void logger::set_pattern(std::string pattern, pattern_time_type time_type) &
 {
     auto new_formatter = details::make_unique<pattern_formatter>(std::move(pattern), time_type);
     set_formatter(std::move(new_formatter));
 }
 
 // create new backtrace sink and move to it all our child sinks
-SPDLOG_INLINE void logger::enable_backtrace(size_t n_messages)
+SPDLOG_INLINE void logger::enable_backtrace(size_t n_messages) &
 {
     tracer_.enable(n_messages);
 }
 
 // restore orig sinks and level and delete the backtrace sink
-SPDLOG_INLINE void logger::disable_backtrace()
+SPDLOG_INLINE void logger::disable_backtrace() &
 {
     tracer_.disable();
 }
@@ -138,24 +148,29 @@ SPDLOG_INLINE level::level_enum logger::flush_level() const
 }
 
 // sinks
-SPDLOG_INLINE const std::vector<sink_ptr> &logger::sinks() const
+SPDLOG_INLINE std::vector<sink_ptr> logger::sinks() &&
+{
+    return std::move(sinks_);
+}
+
+SPDLOG_INLINE const std::vector<sink_ptr> &logger::sinks() const &
 {
     return sinks_;
 }
 
-SPDLOG_INLINE std::vector<sink_ptr> &logger::sinks()
+SPDLOG_INLINE std::vector<sink_ptr> &logger::sinks() &
 {
     return sinks_;
 }
 
 // error handler
-SPDLOG_INLINE void logger::set_error_handler(err_handler handler)
+SPDLOG_INLINE void logger::set_error_handler(err_handler handler) &
 {
     custom_err_handler_ = std::move(handler);
 }
 
 // create new logger with same sinks and configuration.
-SPDLOG_INLINE std::shared_ptr<logger> logger::clone(std::string logger_name)
+SPDLOG_INLINE std::shared_ptr<logger> logger::clone(std::string logger_name) const &
 {
     auto cloned = std::make_shared<logger>(*this);
     cloned->name_ = std::move(logger_name);
diff --git a/include/spdlog/logger.h b/include/spdlog/logger.h
index a34c5221..ae608104 100644
--- a/include/spdlog/logger.h
+++ b/include/spdlog/logger.h
@@ -69,62 +69,62 @@ public:
 
     logger(const logger &other);
     logger(logger &&other) SPDLOG_NOEXCEPT;
-    logger &operator=(logger other) SPDLOG_NOEXCEPT;
+    logger &operator=(logger other) & SPDLOG_NOEXCEPT;
 
-    void swap(spdlog::logger &other) SPDLOG_NOEXCEPT;
+    void swap(spdlog::logger &other) & SPDLOG_NOEXCEPT;
 
     // FormatString is a type derived from fmt::compile_string
     template<typename FormatString, typename std::enable_if<fmt::is_compile_string<FormatString>::value, int>::type = 0, typename... Args>
-    void log(source_loc loc, level::level_enum lvl, const FormatString &fmt, Args&&...args)
+    void log(source_loc loc, level::level_enum lvl, const FormatString &fmt, Args &&...args)
     {
         log_(loc, lvl, fmt, std::forward<Args>(args)...);
     }
 
     // FormatString is NOT a type derived from fmt::compile_string but is a string_view_t or can be implicitly converted to one
     template<typename... Args>
-    void log(source_loc loc, level::level_enum lvl, string_view_t fmt, Args&&...args)
+    void log(source_loc loc, level::level_enum lvl, string_view_t fmt, Args &&...args)
     {
         log_(loc, lvl, fmt, std::forward<Args>(args)...);
     }
 
     template<typename FormatString, typename... Args>
-    void log(level::level_enum lvl, const FormatString &fmt, Args&&...args)
+    void log(level::level_enum lvl, const FormatString &fmt, Args &&...args)
     {
         log(source_loc{}, lvl, fmt, std::forward<Args>(args)...);
     }
 
     template<typename FormatString, typename... Args>
-    void trace(const FormatString &fmt, Args&&...args)
+    void trace(const FormatString &fmt, Args &&...args)
     {
         log(level::trace, fmt, std::forward<Args>(args)...);
     }
 
     template<typename FormatString, typename... Args>
-    void debug(const FormatString &fmt, Args&&...args)
+    void debug(const FormatString &fmt, Args &&...args)
     {
         log(level::debug, fmt, std::forward<Args>(args)...);
     }
 
     template<typename FormatString, typename... Args>
-    void info(const FormatString &fmt, Args&&...args)
+    void info(const FormatString &fmt, Args &&...args)
     {
         log(level::info, fmt, std::forward<Args>(args)...);
     }
 
     template<typename FormatString, typename... Args>
-    void warn(const FormatString &fmt, Args&&...args)
+    void warn(const FormatString &fmt, Args &&...args)
     {
         log(level::warn, fmt, std::forward<Args>(args)...);
     }
 
     template<typename FormatString, typename... Args>
-    void error(const FormatString &fmt, Args&&...args)
+    void error(const FormatString &fmt, Args &&...args)
     {
         log(level::err, fmt, std::forward<Args>(args)...);
     }
 
     template<typename FormatString, typename... Args>
-    void critical(const FormatString &fmt, Args&&...args)
+    void critical(const FormatString &fmt, Args &&...args)
     {
         log(level::critical, fmt, std::forward<Args>(args)...);
     }
@@ -225,7 +225,7 @@ public:
 #else
 
     template<typename... Args>
-    void log(source_loc loc, level::level_enum lvl, wstring_view_t fmt, Args&&...args)
+    void log(source_loc loc, level::level_enum lvl, wstring_view_t fmt, Args &&...args)
     {
         bool log_enabled = should_log(lvl);
         bool traceback_enabled = tracer_.enabled();
@@ -282,22 +282,24 @@ public:
         return tracer_.enabled();
     }
 
-    void set_level(level::level_enum log_level);
+    void set_level(level::level_enum log_level) &;
 
     level::level_enum level() const;
 
-    const std::string &name() const;
+    std::string name() &&;
+    const std::string &name() const&;
+    std::string &name() &;
 
     // set formatting for the sinks in this logger.
     // each sink will get a separate instance of the formatter object.
-    void set_formatter(std::unique_ptr<formatter> f);
+    void set_formatter(std::unique_ptr<formatter> f) &;
 
-    void set_pattern(std::string pattern, pattern_time_type time_type = pattern_time_type::local);
+    void set_pattern(std::string pattern, pattern_time_type time_type = pattern_time_type::local) &;
 
     // backtrace support.
     // efficiently store all debug/trace messages in a circular buffer until needed for debugging.
-    void enable_backtrace(size_t n_messages);
-    void disable_backtrace();
+    void enable_backtrace(size_t n_messages) &;
+    void disable_backtrace() &;
     void dump_backtrace();
 
     // flush functions
@@ -306,15 +308,15 @@ public:
     level::level_enum flush_level() const;
 
     // sinks
-    const std::vector<sink_ptr> &sinks() const;
-
-    std::vector<sink_ptr> &sinks();
+    std::vector<sink_ptr> sinks() &&;
+    const std::vector<sink_ptr> &sinks() const &;
+    std::vector<sink_ptr> &sinks() &;
 
     // error handler
-    void set_error_handler(err_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);
+    virtual std::shared_ptr<logger> clone(std::string logger_name) const&;
 
 protected:
     std::string name_;
@@ -326,7 +328,7 @@ protected:
 
     // common implementation for after templated public api has been resolved
     template<typename FormatString, typename... Args>
-    void log_(source_loc loc, level::level_enum lvl, const FormatString &fmt, Args&&...args)
+    void log_(source_loc loc, level::level_enum lvl, const FormatString &fmt, Args &&...args)
     {
         bool log_enabled = should_log(lvl);
         bool traceback_enabled = tracer_.enabled();
diff --git a/include/spdlog/pattern_formatter-inl.h b/include/spdlog/pattern_formatter-inl.h
index c6cd5e83..c324299d 100644
--- a/include/spdlog/pattern_formatter-inl.h
+++ b/include/spdlog/pattern_formatter-inl.h
@@ -1064,7 +1064,7 @@ SPDLOG_INLINE void pattern_formatter::format(const details::log_msg &msg, memory
     details::fmt_helper::append_string_view(eol_, dest);
 }
 
-SPDLOG_INLINE void pattern_formatter::set_pattern(std::string pattern)
+SPDLOG_INLINE void pattern_formatter::set_pattern(std::string pattern) &
 {
     pattern_ = std::move(pattern);
     compile_pattern_(pattern_);
diff --git a/include/spdlog/pattern_formatter.h b/include/spdlog/pattern_formatter.h
index bc13ae10..4a483393 100644
--- a/include/spdlog/pattern_formatter.h
+++ b/include/spdlog/pattern_formatter.h
@@ -68,7 +68,7 @@ class SPDLOG_API custom_flag_formatter : public details::flag_formatter
 public:
     virtual std::unique_ptr<custom_flag_formatter> clone() const = 0;
 
-    void set_padding_info(details::padding_info padding)
+    void set_padding_info(details::padding_info padding) &
     {
         flag_formatter::padinfo_ = padding;
     }
@@ -92,12 +92,12 @@ public:
     void format(const details::log_msg &msg, memory_buf_t &dest) override;
 
     template<typename T, typename... Args>
-    pattern_formatter &add_flag(char flag, Args&&...args)
+    pattern_formatter &add_flag(char flag, Args&&...args) &
     {
         custom_handlers_[flag] = details::make_unique<T>(std::forward<Args>(args)...);
         return *this;
     }
-    void set_pattern(std::string pattern);
+    void set_pattern(std::string pattern) &;
 
 private:
     std::string pattern_;
diff --git a/include/spdlog/stopwatch.h b/include/spdlog/stopwatch.h
index bb976b19..af77b34e 100644
--- a/include/spdlog/stopwatch.h
+++ b/include/spdlog/stopwatch.h
@@ -40,7 +40,7 @@ public:
         return std::chrono::duration<double>(clock::now() - start_tp_);
     }
 
-    void reset()
+    void reset() &
     {
         start_tp_ = clock ::now();
     }