Add `none` literal that is convertible to `Optional`. (#2356)

* Add `none` literal that is convertible to `Optional`.

* Fix cpu code gen.

* Include vk and cpu test for is-as operator test.

* Inline comparison operators.

Co-authored-by: Yong He <yhe@nvidia.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/source/slang/slang-ast-builder.cpp b/source/slang/slang-ast-builder.cpp
index 2acdc26d3..fa8051171 100644
--- a/source/slang/slang-ast-builder.cpp
+++ b/source/slang/slang-ast-builder.cpp
@@ -131,6 +131,16 @@ Type* SharedASTBuilder::getNullPtrType()
     return m_nullPtrType;
 }
 
+Type* SharedASTBuilder::getNoneType()
+{
+    if (!m_noneType)
+    {
+        auto noneTypeDecl = findMagicDecl("NoneType");
+        m_noneType = DeclRefType::create(m_astBuilder, makeDeclRef<Decl>(noneTypeDecl));
+    }
+    return m_noneType;
+}
+
 SharedASTBuilder::~SharedASTBuilder()
 {
     // Release built in types..