cmExperimental: Expose feature data API

Source/cmExperimental.cxx

@@ -18,14 +18,7 @@ namespace {
  * Search for other instances to keep the documentation and test suite
  * up-to-date.
  */
-
-struct FeatureData
-{
-  std::string const Uuid;
-  std::string const Variable;
-  std::string const Description;
-  bool Warned;
-} LookupTable[] = {
+cmExperimental::FeatureData LookupTable[] = {
   // CxxModuleCMakeApi
   { "bf70d4b0-9fb7-465c-9803-34014e70d112",
     "CMAKE_EXPERIMENTAL_CXX_MODULE_CMAKE_API",
@@ -37,17 +30,22 @@ static_assert(sizeof(LookupTable) / sizeof(LookupTable[0]) ==
                 static_cast<size_t>(cmExperimental::Feature::Sentinel),
               "Experimental feature lookup table mismatch");
 
-FeatureData& DataForFeature(cmExperimental::Feature f)
+cmExperimental::FeatureData& DataForFeature(cmExperimental::Feature f)
 {
   assert(f != cmExperimental::Feature::Sentinel);
   return LookupTable[static_cast<size_t>(f)];
 }
 }
 
+const cmExperimental::FeatureData& cmExperimental::DataForFeature(Feature f)
+{
+  return ::DataForFeature(f);
+}
+
 bool cmExperimental::HasSupportEnabled(cmMakefile const& mf, Feature f)
 {
   bool enabled = false;
-  auto& data = DataForFeature(f);
+  auto& data = ::DataForFeature(f);
 
   auto value = mf.GetDefinition(data.Variable);
   if (value == data.Uuid) {

Source/cmExperimental.h

@@ -5,6 +5,8 @@
 
 #include "cmConfigure.h" // IWYU pragma: keep
 
+#include <string>
+
 class cmMakefile;
 
 class cmExperimental
@@ -17,5 +19,14 @@ public:
     Sentinel,
   };
 
+  struct FeatureData
+  {
+    std::string const Uuid;
+    std::string const Variable;
+    std::string const Description;
+    bool Warned;
+  };
+
+  static const FeatureData& DataForFeature(Feature f);
   static bool HasSupportEnabled(cmMakefile const& mf, Feature f);
 };