From fc9968dc4fd58fab37476f48e4405c2743c5349c Mon Sep 17 00:00:00 2001
From: Yong He <yonghe@outlook.com>
Date: Mon, 8 Mar 2021 10:01:20 -0800
Subject: Refactor window library. (#1739)

* Refactor window library.

* Fix project file

* Fix warnings.
---
 source/core/slang-func-ptr.h | 202 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 202 insertions(+)
 create mode 100644 source/core/slang-func-ptr.h

(limited to 'source')

diff --git a/source/core/slang-func-ptr.h b/source/core/slang-func-ptr.h
new file mode 100644
index 000000000..c861bc6b8
--- /dev/null
+++ b/source/core/slang-func-ptr.h
@@ -0,0 +1,202 @@
+#ifndef SLANG_CORE_FUNC_PTR_H
+#define SLANG_CORE_FUNC_PTR_H
+
+#include "slang-smart-pointer.h"
+
+namespace Slang
+{
+
+template <typename TResult, typename... Arguments> class FuncPtr : public RefObject
+{
+public:
+    virtual TResult operator()(Arguments...) const = 0;
+    virtual bool operator==(const FuncPtr<TResult, Arguments...>*) { return false; }
+    virtual FuncPtr<TResult, Arguments...>* clone() = 0;
+    virtual ~FuncPtr() {}
+};
+
+template <typename TResult, typename... Arguments>
+class CdeclFuncPtr : public FuncPtr<TResult, Arguments...>
+{
+public:
+    typedef TResult (*FuncType)(Arguments...);
+
+private:
+    FuncType funcPtr;
+
+public:
+    CdeclFuncPtr(FuncType func)
+        : funcPtr(func)
+    {}
+    virtual FuncPtr<TResult, Arguments...>* clone() override
+    {
+        auto rs = new CdeclFuncPtr<TResult, Arguments...>(funcPtr);
+        return rs;
+    }
+
+    virtual TResult operator()(Arguments... params) const override { return funcPtr(params...); }
+
+    virtual bool operator==(const FuncPtr<TResult, Arguments...>* ptr) override
+    {
+        auto cptr = dynamic_cast<const CdeclFuncPtr<TResult, Arguments...>*>(ptr);
+        if (cptr)
+            return funcPtr == cptr->funcPtr;
+        else
+            return false;
+    }
+};
+
+template <typename Class, typename TResult, typename... Arguments>
+class MemberFuncPtr : public FuncPtr<TResult, Arguments...>
+{
+public:
+    typedef TResult (Class::*FuncType)(Arguments...);
+
+private:
+    FuncType funcPtr;
+    Class* object;
+
+public:
+    MemberFuncPtr(Class* obj, FuncType func)
+        : funcPtr(func)
+        , object(obj)
+    {}
+    virtual FuncPtr<TResult, Arguments...>* clone() override
+    {
+        auto rs = new MemberFuncPtr<Class, TResult, Arguments...>(object, funcPtr);
+        return rs;
+    }
+    virtual TResult operator()(Arguments... params) const override
+    {
+        return (object->*funcPtr)(params...);
+    }
+
+    virtual bool operator==(const FuncPtr<TResult, Arguments...>* ptr) override
+    {
+        auto cptr = dynamic_cast<const MemberFuncPtr<Class, TResult, Arguments...>*>(ptr);
+        if (cptr)
+            return funcPtr == cptr->funcPtr && object == cptr->object;
+        else
+            return false;
+    }
+};
+
+template <typename F, typename TResult, typename... Arguments>
+class LambdaFuncPtr : public FuncPtr<TResult, Arguments...>
+{
+private:
+    F func;
+
+public:
+    LambdaFuncPtr(const F& _func)
+        : func(_func)
+    {}
+    virtual TResult operator()(Arguments... params) const override { return func(params...); }
+    virtual FuncPtr<TResult, Arguments...>* clone() override
+    {
+        auto rs = new LambdaFuncPtr<F, TResult, Arguments...>(func);
+        return rs;
+    }
+    virtual bool operator==(const FuncPtr<TResult, Arguments...>* /*ptr*/) override
+    {
+        return false;
+    }
+};
+
+template <typename TResult, typename... Arguments> class Func
+{
+private:
+    RefPtr<FuncPtr<TResult, Arguments...>> funcPtr;
+
+public:
+    Func() {}
+    Func(typename CdeclFuncPtr<TResult, Arguments...>::FuncType func)
+    {
+        funcPtr = new CdeclFuncPtr<TResult, Arguments...>(func);
+    }
+    template <typename Class>
+    Func(Class* object, typename MemberFuncPtr<Class, TResult, Arguments...>::FuncType func)
+    {
+        funcPtr = new MemberFuncPtr<Class, TResult, Arguments...>(object, func);
+    }
+    template <typename TFuncObj> Func(const TFuncObj& func)
+    {
+        funcPtr = new LambdaFuncPtr<TFuncObj, TResult, Arguments...>(func);
+    }
+    Func& operator=(typename CdeclFuncPtr<TResult, Arguments...>::FuncType func)
+    {
+        funcPtr = new CdeclFuncPtr<TResult, Arguments...>(func);
+        return *this;
+    }
+    template <typename Class>
+    Func& operator=(const MemberFuncPtr<Class, TResult, Arguments...>& func)
+    {
+        funcPtr = new MemberFuncPtr<Class, TResult, Arguments...>(func);
+        return *this;
+    }
+    template <typename TFuncObj> Func& operator=(const TFuncObj& func)
+    {
+        funcPtr = new LambdaFuncPtr<TFuncObj, TResult, Arguments...>(func);
+        return *this;
+    }
+    bool operator==(const Func& f) { return *funcPtr == f.funcPtr.Ptr(); }
+    bool operator!=(const Func& f) { return !(*this == f); }
+    TResult operator()(Arguments... params) const { return (*funcPtr)(params...); }
+};
+
+// template<typename... Arguments>
+// using Action = Func<void, Arguments...>;
+
+template <typename... Arguments> class Action : public Func<void, Arguments...>
+{
+private:
+    RefPtr<FuncPtr<void, Arguments...>> funcPtr;
+
+public:
+    Action() {}
+    Action(const Action& proc) { funcPtr = proc.funcPtr; }
+    Action(typename CdeclFuncPtr<void, Arguments...>::FuncType func)
+    {
+        funcPtr = new CdeclFuncPtr<void, Arguments...>(func);
+    }
+    template <typename Class>
+    Action(Class* object, typename MemberFuncPtr<Class, void, Arguments...>::FuncType func)
+    {
+        funcPtr = new MemberFuncPtr<Class, void, Arguments...>(object, func);
+    }
+    template <typename TFuncObj> Action(const TFuncObj& func)
+    {
+        funcPtr = new LambdaFuncPtr<TFuncObj, void, Arguments...>(func);
+    }
+    Action& operator=(typename CdeclFuncPtr<void, Arguments...>::FuncType func)
+    {
+        funcPtr = new CdeclFuncPtr<void, Arguments...>(func);
+        return *this;
+    }
+    template <typename Class>
+    Action& operator=(const MemberFuncPtr<Class, void, Arguments...>& func)
+    {
+        funcPtr = new MemberFuncPtr<Class, void, Arguments...>(func);
+        return *this;
+    }
+    template <typename TFuncObj> Action& operator=(const TFuncObj& func)
+    {
+        funcPtr = new LambdaFuncPtr<TFuncObj, void, Arguments...>(func);
+        return *this;
+    }
+    Action& operator=(const Action& proc)
+    {
+        funcPtr = proc.funcPtr;
+        return *this;
+    }
+    void clear() { funcPtr = nullptr; }
+    void operator()(Arguments... params) const
+    {
+        if (funcPtr)
+            (*funcPtr)(params...);
+    }
+};
+
+} // namespace Slang
+
+#endif
-- 
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