Translate if constexpr

Author: lucic71

cpp2rust/converter/converter.cpp

@@ -1356,6 +1356,15 @@ 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;
+    }
+  }
+
   if (auto *init = stmt->getInit()) {
     PushBrace scope(*this);
     Convert(init);

cpp2rust/converter/converter.h

@@ -424,6 +424,7 @@ 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);