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author | Dan Liew <daniel.liew@imperial.ac.uk> | 2015-01-25 20:51:44 +0000 |
---|---|---|
committer | Dan Liew <daniel.liew@imperial.ac.uk> | 2015-01-25 20:51:44 +0000 |
commit | ffcf2c27da335ff452a0c2388c33195ff59c8550 (patch) | |
tree | 7814f6a96e0ff07557d6a45a16354eadc37c2e22 /Source/VCExpr/Boogie2VCExpr.cs | |
parent | 75a170c34ad60fda22961045cfcdb89fda3f4571 (diff) |
Change the return type of StandardVisitor.VisitExistsExpr() from
ExistsExpr to Expr. Enforcing the return type be ExistsExpr 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.
a visitor that does constant folding of an Expr tree
Diffstat (limited to 'Source/VCExpr/Boogie2VCExpr.cs')
-rw-r--r-- | Source/VCExpr/Boogie2VCExpr.cs | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/Source/VCExpr/Boogie2VCExpr.cs b/Source/VCExpr/Boogie2VCExpr.cs index f261553b..7cd3d240 100644 --- a/Source/VCExpr/Boogie2VCExpr.cs +++ b/Source/VCExpr/Boogie2VCExpr.cs @@ -454,7 +454,7 @@ namespace Microsoft.Boogie.VCExprAST { return node;
}
- public override ExistsExpr VisitExistsExpr(ExistsExpr node) {
+ public override Expr VisitExistsExpr(ExistsExpr node) {
//Contract.Requires(node != null);
Contract.Ensures(Contract.Result<ExistsExpr>() != null);
node = (ExistsExpr)this.VisitQuantifierExpr(node);
|