Continue std::formatter for AST nodes

- requires Clang/libc++19, see https://godbolt.org/z/rc1sszThT

.vscode/dictionaries/project_words.txt

@@ -17,6 +17,7 @@ libcpp
 MAXSIZE
 msvc
 NOCOMPRESS
+nullary
 pkgs
 ptrace
 pwsh

.vscode/settings.json

@@ -147,12 +147,8 @@
         ]
     },
     "files.associations": {
-        "format": "cpp",
-        "source_location": "cpp",
-        "vector": "cpp",
-        "future": "cpp",
-        "system_error": "cpp",
         "algorithm": "cpp",
+        "any": "cpp",
         "array": "cpp",
         "atomic": "cpp",
         "bit": "cpp",
@@ -181,11 +177,12 @@
         "cwctype": "cpp",
         "deque": "cpp",
         "exception": "cpp",
-        "resumable": "cpp",
         "filesystem": "cpp",
+        "format": "cpp",
         "forward_list": "cpp",
         "fstream": "cpp",
         "functional": "cpp",
+        "future": "cpp",
         "initializer_list": "cpp",
         "iomanip": "cpp",
         "ios": "cpp",
@@ -198,26 +195,33 @@
         "locale": "cpp",
         "map": "cpp",
         "memory": "cpp",
+        "memory_resource": "cpp",
         "mutex": "cpp",
         "new": "cpp",
+        "numbers": "cpp",
         "numeric": "cpp",
         "optional": "cpp",
         "ostream": "cpp",
+        "print": "cpp",
         "queue": "cpp",
         "random": "cpp",
         "ranges": "cpp",
         "ratio": "cpp",
         "regex": "cpp",
+        "resumable": "cpp",
         "set": "cpp",
         "shared_mutex": "cpp",
+        "source_location": "cpp",
         "span": "cpp",
         "sstream": "cpp",
         "stdexcept": "cpp",
         "stdfloat": "cpp",
         "stop_token": "cpp",
         "streambuf": "cpp",
         "string": "cpp",
+        "string_view": "cpp",
         "strstream": "cpp",
+        "system_error": "cpp",
         "thread": "cpp",
         "tuple": "cpp",
         "type_traits": "cpp",
@@ -228,6 +232,7 @@
         "utility": "cpp",
         "valarray": "cpp",
         "variant": "cpp",
+        "vector": "cpp",
         "xfacet": "cpp",
         "xhash": "cpp",
         "xiosbase": "cpp",
@@ -243,8 +248,13 @@
         "xtr1common": "cpp",
         "xtree": "cpp",
         "xutility": "cpp",
-        "any": "cpp",
-        "memory_resource": "cpp",
-        "*.ipp": "cpp"
+        "*.ipp": "cpp",
+        "*.tcc": "cpp",
+        "__bit_reference": "cpp",
+        "__node_handle": "cpp",
+        "__split_buffer": "cpp",
+        "__threading_support": "cpp",
+        "__tree": "cpp",
+        "__verbose_abort": "cpp"
     }
 }

source/common/src/file_loader.cpp

@@ -197,7 +197,7 @@ std::time_t file_loader::timesstamp(fs::path const& filename) const
 
     // See [How to convert std::filesystem::file_time_type to time_t?](
     //  https://stackoverflow.com/questions/61030383/how-to-convert-stdfilesystemfile-time-type-to-time-t)
-    if constexpr (ibis::build_compiler_has_libcpp) {
+    if constexpr (ibis::build_compiler_has_libcpp == true) {
         // handle libc++ compile error: no member named 'clock_cast' in namespace 'std::chrono'
         auto const to_time_t = [](fs::file_time_type time_point) {
             using namespace std::chrono;
@@ -210,9 +210,10 @@ std::time_t file_loader::timesstamp(fs::path const& filename) const
         return sys_time;
     }
     else {
+#if !defined(_LIBCPP_VERSION)  // hide "faulty code" from Clang/libc++ (clock_cast<> won't found)
         auto const sys_time = chrono::clock_cast<chrono::system_clock>(file_time);
-
         return chrono::system_clock::to_time_t(sys_time);
+#endif
     }
 }
 

source/util/include/ibis/util/platform.hpp.in

@@ -82,10 +82,11 @@ constexpr ibis::platform_compiler build_compiler_variant = platform_compiler::Cl
 ///
 /// Some code parts require special handling for use with libc++, namely macOS
 ///
-#ifdef _LIBCPP_VERSION
+#if defined(_LIBCPP_VERSION)
 // [How to detect -stdlib=libc++ in the preprocessor?](
 //  https://stackoverflow.com/questions/31657499/how-to-detect-stdlib-libc-in-the-preprocessor)
 constexpr bool build_compiler_has_libcpp = true;
+// #pragma message "libc++"
 #else
 constexpr bool build_compiler_has_libcpp = false;
 #endif