Add functor syntax support. (#4926)

1 files changed, 40 insertions, 0 deletions

diff --git a/tests/language-feature/ifunc/functor.slang b/tests/language-feature/ifunc/functor.slang
new file mode 100644
index 000000000..73987cbbf
--- /dev/null
+++ b/tests/language-feature/ifunc/functor.slang
@@ -0,0 +1,40 @@
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-shaderobj -output-using-type
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-dx12 -use-dxil -shaderobj -output-using-type
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-cpu -shaderobj -output-using-type
+//TEST(compute):COMPARE_COMPUTE(filecheck-buffer=CHECK):-vk -shaderobj -output-using-type
+
+struct Functor : IMutatingFunc<float, float>
+{
+    int context;
+
+    [mutating]
+    float operator()(float p)
+    {
+        context += (int)p;
+        return context;
+    }
+}
+
+float apply<T:IMutatingFunc<float,float>>(inout T f, float p)
+{
+    return f(p);
+}
+
+//TEST_INPUT:ubuffer(data=[0 3 2 2], stride=4):out,name=outputBuffer
+RWStructuredBuffer<uint> outputBuffer;
+
+[numthreads(1, 1, 1)]
+void computeMain(uint tid: SV_DispatchThreadID)
+{
+    Functor f;
+    f.context = 0;
+    
+    f(1.0f);
+    f.operator()(1.0f); // explicit operator () call should also work.
+
+    apply(f, 2.0f);
+    apply(f, 3.0f);
+
+    // CHECK: 7
+    outputBuffer[0] = (uint)f.context;
+}