From 458be604ebe9f9ed93a2b8af4c424493f119cd8c Mon Sep 17 00:00:00 2001 From: Dan Liew Date: Sun, 25 Jan 2015 19:06:23 +0000 Subject: Change the return type of StandardVisitor.VisitBvConcatExpr() from BvConcatExpr to Expr. Enforcing the return type be BvConcatExpr is too restrictive. For example it prevents anyone from implementing a visitor that does constant folding of an Expr tree. There is precedence for this. For example VisitNAryExpr() returns an Expr not an NAryExpr. Unfortunately this a breaking API change so anyone who subclasses the StandardVisitor (or one of its sub classes) and overrides this method will get compilation errors until they change the return type. --- Source/VCExpr/Boogie2VCExpr.cs | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'Source/VCExpr/Boogie2VCExpr.cs') diff --git a/Source/VCExpr/Boogie2VCExpr.cs b/Source/VCExpr/Boogie2VCExpr.cs index 91c17b23..3e78bb4b 100644 --- a/Source/VCExpr/Boogie2VCExpr.cs +++ b/Source/VCExpr/Boogie2VCExpr.cs @@ -574,7 +574,7 @@ namespace Microsoft.Boogie.VCExprAST { /////////////////////////////////////////////////////////////////////////////////// - public override BvConcatExpr VisitBvConcatExpr(BvConcatExpr node) { + public override Expr VisitBvConcatExpr(BvConcatExpr node) { //Contract.Requires(node != null); Contract.Ensures(Contract.Result() != null); Push(TranslateBvConcatExpr(node)); -- cgit v1.2.3