added src_loc feature

include/spdlog/common.h

@@ -5,6 +5,7 @@
 
 #include <spdlog/tweakme.h>
 #include <spdlog/details/null_mutex.h>
+#include <spdlog/details/source_location.h>
 
 #include <atomic>
 #include <chrono>
@@ -16,6 +17,8 @@
 #include <functional>
 #include <cstdio>
 
+
+
 #ifdef SPDLOG_USE_STD_FORMAT
 #    include <version>
 #    if __cpp_lib_format >= 202207L
@@ -114,6 +117,45 @@ namespace spdlog {
 
 class formatter;
 
+struct source_loc
+{
+    SPDLOG_CONSTEXPR source_loc() = default;
+    SPDLOG_CONSTEXPR source_loc(const char *filename_in, int line_in, const char *funcname_in)
+        : filename{filename_in}
+        , line{line_in}
+        , funcname{funcname_in}
+    {}
+
+    SPDLOG_CONSTEXPR bool empty() const SPDLOG_NOEXCEPT
+    {
+        return line == 0;
+    }
+    const char *filename{nullptr};
+    int line{0};
+    const char *funcname{nullptr};
+};
+
+template<typename T>
+struct format_string_wrapper
+{
+    format_string_wrapper(const char *fmt, details::source_location loc = details::source_location::current())
+        : fmt_{fmt}
+        , loc_{loc}
+    {}
+    T fmt()
+    {
+        return fmt_;
+    }
+    source_loc loc()
+    {
+        return source_loc{loc_.file_name(), loc_.line(), loc_.function_name()};
+    }
+
+private:
+    T fmt_;
+    spdlog::details::source_location loc_;
+};
+
 namespace sinks {
 class sink;
 }
@@ -138,13 +180,15 @@ namespace fmt_lib = std;
 using string_view_t = std::string_view;
 using memory_buf_t = std::string;
 
+
 template<typename... Args>
 #    if __cpp_lib_format >= 202207L
-using format_string_t = std::format_string<Args...>;
+using format_string_t = format_string_wrapper<std::format_string<Args...>>;
 #    else
-using format_string_t = std::string_view;
+using format_string_t = format_string_wrapper<std::string_view>;
 #    endif
 
+
 template<class T, class Char = char>
 struct is_convertible_to_basic_format_string : std::integral_constant<bool, std::is_convertible<T, std::basic_string_view<Char>>::value>
 {};
@@ -155,9 +199,9 @@ using wmemory_buf_t = std::wstring;
 
 template<typename... Args>
 #        if __cpp_lib_format >= 202207L
-using wformat_string_t = std::wformat_string<Args...>;
+using wformat_string_t = format_string_wrapper<std::wformat_string<Args...>>;
 #        else
-using wformat_string_t = std::wstring_view;
+using wformat_string_t = format_string_wrapper<std::wstring_view>;
 #        endif
 #    endif
 #    define SPDLOG_BUF_TO_STRING(x) x
@@ -168,7 +212,7 @@ using string_view_t = fmt::basic_string_view<char>;
 using memory_buf_t = fmt::basic_memory_buffer<char, 250>;
 
 template<typename... Args>
-using format_string_t = fmt::format_string<Args...>;
+using format_string_t = format_string_wrapper<fmt::format_string<Args...>>;
 
 template<class T>
 using remove_cvref_t = typename std::remove_cv<typename std::remove_reference<T>::type>::type;
@@ -301,24 +345,6 @@ private:
 [[noreturn]] SPDLOG_API void throw_spdlog_ex(const std::string &msg, int last_errno);
 [[noreturn]] SPDLOG_API void throw_spdlog_ex(std::string msg);
 
-struct source_loc
-{
-    SPDLOG_CONSTEXPR source_loc() = default;
-    SPDLOG_CONSTEXPR source_loc(const char *filename_in, int line_in, const char *funcname_in)
-        : filename{filename_in}
-        , line{line_in}
-        , funcname{funcname_in}
-    {}
-
-    SPDLOG_CONSTEXPR bool empty() const SPDLOG_NOEXCEPT
-    {
-        return line == 0;
-    }
-    const char *filename{nullptr};
-    int line{0};
-    const char *funcname{nullptr};
-};
-
 struct file_event_handlers
 {
     file_event_handlers()