Translate if constexpr

Author: lucic71

cpp2rust/converter/converter.cpp

@@ -1254,6 +1254,14 @@ void Converter::ConvertCondition(clang::Expr *cond) {
 }
 
 bool Converter::VisitIfStmt(clang::IfStmt *stmt) {
+  if (stmt->isConstexpr()) {
+    if (auto taken = stmt->getNondiscardedCase(ctx_)) {
+      if (*taken) {
+        Convert(*taken);
+      }
+      return false;
+    }
+  }
   StrCat(keyword::kIf);
   ConvertCondition(stmt->getCond());
   ConvertBody(stmt->getThen());

cpp2rust/converter/converter.h

@@ -405,6 +405,7 @@ class Converter : public clang::RecursiveASTVisitor<Converter> {
   VisitUnaryExprOrTypeTraitExpr(clang::UnaryExprOrTypeTraitExpr *expr);
 
   virtual bool VisitTypeTraitExpr(clang::TypeTraitExpr *expr);
+
   virtual bool VisitSizeOfPackExpr(clang::SizeOfPackExpr *expr);
 
   virtual bool VisitOffsetOfExpr(clang::OffsetOfExpr *expr);