Fixed warnings and unused include map

README.md

@@ -195,18 +195,6 @@ void binary_example()
 
 ```
 
----
-#### Mapped diagnostic context (MDC)
-MDC is a map of contextual information that can be used to enrich log messages.
-It is a map of key-value pairs that can be set on a per-thread basis since it is stored in thread-local storage.
-```c++
-#include "spdlog/spdlog.h"
-#include "spdlog/mdc"
-...
-spdlog::mdc::put("key1", "value1");
-spdlog::mdc::put("key2", "value2");
-```
-
 ---
 #### Logger with multi sinks - each with a different format and log level
 ```c++

include/spdlog/details/context.h

@@ -11,7 +11,6 @@
 #include <memory>
 #include <mutex>
 #include <string>
-#include <unordered_map>
 
 #include "../common.h"
 #include "./periodic_worker.h"
@@ -24,8 +23,6 @@ class thread_pool;
 
 class SPDLOG_API context {
 public:
-    using log_levels = std::unordered_map<std::string, level>;
-
     static context &instance();
     context(const context &) = delete;
     context &operator=(const context &) = delete;

src/details/context.cpp

@@ -1,10 +1,8 @@
 // Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
 // Distributed under the MIT License (http://opensource.org/licenses/MIT)
 
-#include "spdlog/common.h"
 #include "spdlog/details/context.h"
 #include "spdlog/logger.h"
-#include "spdlog/pattern_formatter.h"
 
 #ifndef SPDLOG_DISABLE_GLOBAL_LOGGER
     // support for the global stdout color logger
@@ -18,10 +16,6 @@
 #endif  // SPDLOG_DISABLE_GLOBAL_LOGGER
 
 #include <memory>
-#include <string>
-#include <unordered_map>
-
-static constexpr size_t small_map_threshold = 10;
 
 namespace spdlog {
 namespace details {
@@ -52,8 +46,7 @@ std::shared_ptr<logger> context::global_logger() {
 // e.g do not call set_global_logger() from one thread while calling spdlog::info() from another.
 logger *context::global_logger_raw() const noexcept{ return global_logger_.get(); }
 
-// set global logger.
-// global logger is stored in global_logger_ (for faster retrieval) and in the loggers_ map.
+// set global logger
 void context::set_logger(std::shared_ptr<logger> new_global_logger) {
     global_logger_ = std::move(new_global_logger);
 }