[VER] 0.3.7-alpha

[Fix] 修复科学表达式数字解析的问题（Lexer引起） 由 Satklomi发现，感谢
[Feat] 增加Compiler相关定义，将开发BytecodeVM
[Tip] Evaluator进入Bug fix阶段，新功能延缓开发。转向VM

src/Evaluator/Value/function.hpp

@@ -0,0 +1,67 @@
+#pragma once
+
+#include <Ast/functionParameters.hpp>
+#include <Context/context_forward.hpp>
+
+#include <atomic>
+#include <functional>
+#include <memory>
+#include <vector>
+
+namespace Fig
+{
+    class Object;
+    class Function
+    {
+    public:
+        std::size_t id;
+        Ast::FunctionParameters paras;
+        TypeInfo retType;
+        Ast::BlockStatement body;
+
+        bool isBuiltin = false;
+        std::function<std::shared_ptr<Object>(const std::vector<std::shared_ptr<Object>> &)> builtin;
+        int builtinParamCount = -1;
+
+        std::shared_ptr<Context> closureContext;
+
+        // ===== Constructors =====
+        Function() :
+            id(nextId()) {}
+
+        Function(Ast::FunctionParameters _paras, TypeInfo _retType, Ast::BlockStatement _body, ContextPtr _closureContext) :
+            id(nextId()), // 分配唯一 ID
+            paras(std::move(_paras)),
+            retType(std::move(_retType)),
+            body(std::move(_body)),
+            closureContext(std::move(_closureContext))
+        {
+        }
+
+        Function(std::function<std::shared_ptr<Object>(const std::vector<std::shared_ptr<Object>> &)> fn, int argc) :
+            id(nextId()), isBuiltin(true), builtin(fn), builtinParamCount(argc) {}
+
+        // ===== Copy / Move =====
+        Function(const Function &other) = default;
+        Function(Function &&) noexcept = default;
+        Function &operator=(const Function &) = default;
+        Function &operator=(Function &&) noexcept = default;
+
+        // ===== Comparison =====
+        bool operator==(const Function &other) const noexcept
+        {
+            return id == other.id;
+        }
+        bool operator!=(const Function &other) const noexcept
+        {
+            return !(*this == other);
+        }
+
+    private:
+        static std::size_t nextId()
+        {
+            static std::atomic<std::size_t> counter{1};
+            return counter++;
+        }
+    };
+} // namespace Fig