Implement C++11 [expr.lambda.prim]p13, which prohibits lambdas in

default arguments if in fact those lambdas capture any entity.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@150282 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 12 insertions, 0 deletions

diff --git a/lib/Sema/SemaDeclCXX.cpp b/lib/Sema/SemaDeclCXX.cpp
index ec92470ae1..a6d7d63b3a 100644
--- a/lib/Sema/SemaDeclCXX.cpp
+++ b/lib/Sema/SemaDeclCXX.cpp
@@ -62,6 +62,7 @@ namespace {
     bool VisitExpr(Expr *Node);
     bool VisitDeclRefExpr(DeclRefExpr *DRE);
     bool VisitCXXThisExpr(CXXThisExpr *ThisE);
+    bool VisitLambdaExpr(LambdaExpr *Lambda);
   };
 
   /// VisitExpr - Visit all of the children of this expression.
@@ -111,6 +112,17 @@ namespace {
                    diag::err_param_default_argument_references_this)
                << ThisE->getSourceRange();
   }
+
+  bool CheckDefaultArgumentVisitor::VisitLambdaExpr(LambdaExpr *Lambda) {
+    // C++11 [expr.lambda.prim]p13:
+    //   A lambda-expression appearing in a default argument shall not
+    //   implicitly or explicitly capture any entity.
+    if (Lambda->capture_begin() == Lambda->capture_end())
+      return false;
+
+    return S->Diag(Lambda->getLocStart(), 
+                   diag::err_lambda_capture_default_arg);
+  }
 }
 
 void Sema::ImplicitExceptionSpecification::CalledDecl(CXXMethodDecl *Method) {