Add "operator bool" to SB APIs

Summary:
Our python version of the SB API has (the python equivalent of)
operator bool, but the C++ version doesn't.

This is because our python operators are added by modify-python-lldb.py,
which performs postprocessing on the swig-generated interface files.

In this patch, I add the "operator bool" to all SB classes which have an
IsValid method (which is the same logic used by modify-python-lldb.py).
This way, we make the two interfaces more constent, and it allows us to
rely on swig's automatic syntesis of python __nonzero__ methods instead
of doing manual fixups.

Reviewers: zturner, jingham, clayborg, jfb, serge-sans-paille

Subscribers: jdoerfert, lldb-commits

Differential Revision: https://reviews.llvm.org/D58792

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@355824 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 0 deletions

diff --git a/include/lldb/API/SBStringList.h b/include/lldb/API/SBStringList.h
index e10153ee3..1df1e45f9 100644
--- a/include/lldb/API/SBStringList.h
+++ b/include/lldb/API/SBStringList.h
@@ -23,6 +23,8 @@ public:
 
   ~SBStringList();
 
+  explicit operator bool() const;
+
   bool IsValid() const;
 
   void AppendString(const char *str);