use size_t to better represent thread id across platforms

include/spdlog/common.h

@@ -59,6 +59,7 @@ using log_clock = std::chrono::system_clock;
 using sink_ptr = std::shared_ptr < sinks::sink > ;
 using sinks_init_list = std::initializer_list < sink_ptr > ;
 using formatter_ptr = std::shared_ptr<spdlog::formatter>;
+using thread_id = std::size_t;
 
 //Log level enum
 namespace level

include/spdlog/details/async_log_helper.h

@@ -59,7 +59,7 @@ class async_log_helper
         std::string logger_name;
         level::level_enum level;
         log_clock::time_point time;
-        uint64_t thread_id;
+        thread_id thread_id;
         std::string txt;
 
         async_msg() = default;
@@ -77,7 +77,7 @@ async_msg(async_msg&& other) SPDLOG_NOEXCEPT:
             logger_name = std::move(other.logger_name);
             level = other.level;
             time = std::move(other.time);
-	    thread_id = other.thread_id;
+            thread_id = other.thread_id;
             txt = std::move(other.txt);
             return *this;
         }
@@ -90,7 +90,7 @@ async_msg(async_msg&& other) SPDLOG_NOEXCEPT:
             logger_name(m.logger_name),
             level(m.level),
             time(m.time),
-	    thread_id(m.thread_id),
+            thread_id(m.thread_id),
             txt(m.raw.data(), m.raw.size())
         {}
 

include/spdlog/details/log_msg.h

@@ -92,7 +92,7 @@ struct log_msg
     std::string logger_name;
     level::level_enum level;
     log_clock::time_point time;
-    uint64_t thread_id;
+    thread_id thread_id;
     fmt::MemoryWriter raw;
     fmt::MemoryWriter formatted;
 };

include/spdlog/details/os.h

@@ -32,11 +32,11 @@
 #  define WIN32_LEAN_AND_MEAN
 # endif
 # include <Windows.h>
-#elif __linux__ 
+#elif __linux__
 #include <sys/syscall.h> //Use gettid() syscall under linux to get thread id
 #include <unistd.h>
 #else
-#include <pthread.h> 
+#include <pthread.h>
 #endif
 
 #include "../common.h"
@@ -172,14 +172,14 @@ inline int utc_minutes_offset(const std::tm& tm = details::os::localtime())
 }
 
 //Return current thread id as 64 bit integer
-inline uint64_t thread_id()
+inline size_t thread_id()
 {
 
 #ifdef _WIN32
     return ::GetCurrentThreadId();
 #elif __linux__
     return  (uint64_t) syscall(SYS_gettid);
-#else     
+#else
     return (uint64_t) pthread_self();
 #endif