added std source_location support

include/spdlog/details/source_location.h

@@ -4,6 +4,18 @@
 
 #include <cstdint>
 
+#ifdef __has_include
+#    if __has_include(<source_location>) && __cplusplus >= 202002L
+#        include <source_location>
+#        define SPDLOG_SOURCE_LOCATION
+#    endif
+#endif
+
+#ifdef SPDLOG_SOURCE_LOCATION
+namespace spdlog::details {
+    using source_location = std::source_location;
+}
+#else
 namespace spdlog {
 namespace details {
 struct source_location {
@@ -12,28 +24,28 @@ public:
     (__clang_major__ >= 9)
   static constexpr source_location
   current(const char *fileName = __builtin_FILE(),
-          const int lineNumber = __builtin_LINE(),
+          const unsigned lineNumber = __builtin_LINE(),
           const char *functionName = __builtin_FUNCTION(),
-          const int columnOffset = __builtin_COLUMN()) noexcept
+          const unsigned columnOffset = __builtin_COLUMN()) noexcept
 #elif defined(__GNUC__) &&                                                    \
     (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8))
   static constexpr source_location
   current(const char *fileName = __builtin_FILE(),
-          const int lineNumber = __builtin_LINE(),
+          const unsigned lineNumber = __builtin_LINE(),
           const char *functionName = __builtin_FUNCTION(),
-          const int columnOffset = 0) noexcept
+          const unsigned columnOffset = 0) noexcept
 #elif defined(_MSC_VER) && (_MSC_VER > 1925)
   static constexpr source_location
   current(const char *fileName = __builtin_FILE(),
-          const int lineNumber = __builtin_LINE(),
+          const unsigned lineNumber = __builtin_LINE(),
           const char *functionName = __builtin_FUNCTION(),
-          const int columnOffset = __builtin_COLUMN()) noexcept
+          const unsigned columnOffset = __builtin_COLUMN()) noexcept
 #else
   static constexpr source_location
   current(const char *fileName = "unsupported",
-          const int lineNumber = 0,
+          const unsigned lineNumber = 0,
           const char *functionName = "unsupported",
-          const int columnOffset = 0) noexcept
+          const unsigned columnOffset = 0) noexcept
 #endif
   {
     return source_location(fileName, lineNumber, functionName, columnOffset);
@@ -46,23 +58,23 @@ public:
 
   constexpr const char *function_name() const noexcept { return functionName; }
 
-  constexpr int line() const noexcept { return lineNumber; }
+  constexpr unsigned line() const noexcept { return lineNumber; }
 
-  constexpr int column() const noexcept { return columnOffset; }
+  constexpr unsigned column() const noexcept { return columnOffset; }
 
 private:
   constexpr source_location(const char *fileName,
-                            const int lineNumber,
+                            const unsigned lineNumber,
                             const char *functionName,
-                            const int columnOffset) noexcept
+                            const unsigned columnOffset) noexcept
       : fileName(fileName), lineNumber(lineNumber), functionName(functionName),
         columnOffset(columnOffset) {}
 
   const char *fileName;
-  const int lineNumber;
+  const unsigned lineNumber;
   const char *functionName;
-  const int columnOffset;
+  const unsigned columnOffset;
 };
 } // namespace details
-
+#endif
 } // namespace spdlog