added support for c2y and gnu2y [skip ci]

Author: firewave

simplecpp.cpp

@@ -3759,6 +3759,8 @@ simplecpp::cstd_t simplecpp::getCStd(const std::string &std)
         return C17;
     if (std == "c23" || std == "gnu23" || std == "c2x" || std == "gnu2x")
         return C23;
+    if (std == "c2y" || std == "gnu2y")
+        return C2Y;
     return CUnknown;
 }
 
@@ -3780,6 +3782,10 @@ std::string simplecpp::getCStdString(cstd_t std)
         // Clang 14, 15, 16, 17 return "202000L"
         // Clang 9, 10, 11, 12, 13, 14, 15, 16, 17 do not support "c23" and "gnu23"
         return "202311L";
+    case C2Y:
+        // supported by GCC 15+ and Clang 19+
+        // Clang 19, 20, 21, 22 return "202400L"
+        return "202500L";
     case CUnknown:
         return "";
     }
@@ -3831,7 +3837,7 @@ std::string simplecpp::getCppStdString(cppstd_t std)
         // Clang 17, 18 return "202302L"
         return "202302L";
     case CPP26:
-        // supported by Clang 17+
+        // supported by GCC 14+ and Clang 17+
         return "202400L";
     case CPPUnknown:
         return "";

simplecpp.h

@@ -48,7 +48,7 @@
 
 namespace simplecpp {
     /** C code standard */
-    enum cstd_t { CUnknown=-1, C89, C99, C11, C17, C23 };
+    enum cstd_t { CUnknown=-1, C89, C99, C11, C17, C23, C2Y };
 
     /** C++ code standard */
     enum cppstd_t { CPPUnknown=-1, CPP03, CPP11, CPP14, CPP17, CPP20, CPP23, CPP26 };