constexpr usage for IsValidIB

DirectXMesh/DirectXMesh.h

@@ -36,7 +36,7 @@ namespace DirectX
     //---------------------------------------------------------------------------------
     // DXGI Format Utilities
     bool __cdecl IsValidVB(_In_ DXGI_FORMAT fmt) noexcept;
-    bool __cdecl IsValidIB(_In_ DXGI_FORMAT fmt) noexcept;
+    constexpr bool __cdecl IsValidIB(_In_ DXGI_FORMAT fmt) noexcept;
     size_t __cdecl BytesPerElement(_In_ DXGI_FORMAT fmt) noexcept;
 
 

DirectXMesh/DirectXMesh.inl

@@ -21,7 +21,7 @@ inline bool __cdecl IsValidVB(DXGI_FORMAT fmt) noexcept
 }
 
 _Use_decl_annotations_
-inline bool __cdecl IsValidIB(DXGI_FORMAT fmt) noexcept
+constexpr inline bool __cdecl IsValidIB(DXGI_FORMAT fmt) noexcept
 {
     return (fmt == DXGI_FORMAT_R32_UINT || fmt == DXGI_FORMAT_R16_UINT) != 0;
 }