Make SlangSession an alias for slang::IGlobalSession (#1011)

* Make SlangSession an alias for slang::IGlobalSession.
Use asInternal/asExternal for casting in slang.cpp
Special case handling of asInternal which argument dependent lookup doesn't find.

* To improve implementation asInternal/asExternal in slang.cpp - tried making the internal impls forward to the Slang:: implementations. This caused ambiguities (for example when a function has using namespace Slang in it). To avoid these problems and make it clear where implementation is coming from use Slang::asInternal and removed the forwarding functions.
Made the impls SLANG_FORCE_INLINE instead of inline.

* Made asInternal/asExternal use SLANG_FORCE_INLINE uniformly.

1 files changed, 5 insertions, 1 deletions

diff --git a/slang.h b/slang.h
index 583072686..281aeba6a 100644
--- a/slang.h
+++ b/slang.h
@@ -1055,10 +1055,14 @@ extern "C"
     
     #define SLANG_UUID_ISlangWriter { 0xec457f0e, 0x9add, 0x4e6b,{ 0x85, 0x1c, 0xd7, 0xfa, 0x71, 0x6d, 0x15, 0xfd } };
 
+    namespace slang {
+    struct IGlobalSession;
+    } // namespace slang
+
     /*!
     @brief An instance of the Slang library.
     */
-    typedef struct SlangSession SlangSession;
+    typedef slang::IGlobalSession SlangSession;
 
     typedef struct SlangProgramLayout SlangProgramLayout;